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Universidad de Puerto Rico Facultad de Educación Recinto de Río Piedras Centro de Investigaciones Educativas Cuaderno de Investigación en la Educación Num. 17, mayo 2002 LAS EDUCADORAS Y SUS METAFORAS EDUCATIVAS: DOS INVESTIGADORES EN ACCION  

Microsoft Academic Search

This article discuss two research-in-action projects that collect and analyze the educational metaphors of two groups of teachers engaged in the reflection of their own educational visions and practices. Both studies were qualitative in nature and the author was a participant researcher. Audiotapes, field notes, minutes and the participants' written reflections, documented a diversity of original metaphors produced in conversation

Angeles Molina Iturrondo


Organizzazione Centro-Sud Trapianti: outcome analysis 1999 to 2002  

Microsoft Academic Search

BackgroundThe Organizzazione Centro-Sud Trapianti (OCST), which was created in 1998, is organized into eight regional areas, each referring to a local Regional Transplant Coordinating Center. Organs are primarily allocated to meet the demands of transplant centers in each regional area. Urgencies, pediatric grafts, and paybacks are managed by an Interregional Transplant Coordinating Center. The aim of the current work is

R. Pretagostini; D. Peritore; R. Donadio; R. Cortesini



Magda Mateus Cardenas, director of Centro Amauta, Cusco, Peru: interview.  


Magda Mateus Cardenas, trained as an anthropologist, is currently director of Centro Amauta, a feminist organization in Peru that addresses issues of gender, class, and culture. In this interview, Mateus Cardenas describes her long involvement with development organizations and grass-roots campaigns to improve women's status. She notes that, although many organizations have adopted a gender perspective, few comprehend its highly political, transformational aspects. Women's rights tend to be viewed by development agencies as just one more factor to be incorporated into development projects rather than as a perspective that changes views of development itself. A genuine gender perspective entails changes in the organizational, social, and political aspects of the themes of autonomy and empowerment, with adaptations of content and methods to local conditions. A precondition to women's emancipation is access to and control of financial and economic resources. This, in turn, requires training in technical skills and access to the marketplace on more competitive terms. PMID:12320745

Sweetman, C



Design of a Heliostat for Centro de Investigaciones de Astronomía (CIDA)  

Microsoft Academic Search

This paper explains the procedure used in the design of a heliostat to be installed at the headquarters of the Centro de Investigaciones de Astronomía, located in the city of Mérida, Venezuela. The heliostat will be used mainly for educational and public outreach programs, so the design specifications did not require compensation for rotation of the Sun's image at the

L. E. Dávila; S. J. Barboza; G. A. Sánchez; F. Della Prugna; J. Cova; S. E. Provenzano; R. D. Chacón



Medical social work in the ‘Centro Nacional de Paraplejicos’, Toledo, spain  

Microsoft Academic Search

The Medical Social Service in the ‘Centro Nacional de Rehabilitatión de Parapléjicos’ of Toledo is briefly explained. Until 30 April 1975, 141 patients were treated in this hospital and the pertinent statistics are shown. The main social problems were housing, pension and job. The Medical Social Service makes use of all its resources to solve these problems.

J Mendoza-Sarmiento; P Diago; M L Enriquez; M L Huertas; M L Ochoa; A Urtiaga



Indicators of Success in Achieving the El Centro College Goals, 1997-2000.  

ERIC Educational Resources Information Center

|This is a report on indicators of success in achieving community college goals at El Centro College (Texas). The report provides statistics from 1997-2000 and focuses on the progress of nine goals: (1) institutionalizing service beyond expectation--according to student satisfaction surveys, campus changes that have occurred between 1996 and 1999…

El Centro Coll., Dallas, TX.


Response of El Centro Steam Plant equipment during the October 15, 1979 Imperial Valley earthquake  

SciTech Connect

For the US Nuclear Regulatory Commission (NRC), Lawrence Livermore National Laboratory (LLNL) performed a dynamic seismic analysis of Unit 4 of the El Centro Steam Plant in El Centro, Calif. Built in 1968, Unit 4 is an oil- or gas-fired, steam-driven turbine-generator that was designed to resist a static lateral force equivalent to 20% of the dead and live load. The unit's structural and mechanical systems sustained only minor damage during the October 15, 1979 Imperial Valley earthquake that produced an estimated 0.5 g peak horizontal ground acceleration (0.66 g vertical) at the site. LLNL's seismic analysis was done to analytically estimate the equipment response, which, when compared to actual observation, will indicate the levels of actual equipment capacity. 15 refs., 51 figs., 11 tabs.

Nelson, T A; Murray, R C; Young, J A; Campbell, R D; Martore, J A; Levin, H A; Reiter, L



On adaptive EVD asymptotic distribution of centro-symmetric covariance matrices  

Microsoft Academic Search

This article investigates the gain in statistical performance\\/complexity of the adaptive estimation of the eigenvalue decomposition (EVD) of covariance matrices when the centro-symmetric (CS) structure of such matrices is utilized. After deriving the asymptotic distribution of the EVD estimators, it is shown, in particular, that the closed-form expressions for the asymptotic covariance of batch and adaptive EVD estimators are very

J.-P. Delmas



Radiometric and chemical parameters in freshwater samples of Centro Experimental Aramar (CTMSP\\/Brazil) environmental monitoring programme  

Microsoft Academic Search

The authors describe experimental results obtained with gamma spectrometry, alpha and beta gross counts, liquid scintillation and fluorometry techniques for the measurement of background radiation, and several other techniques for chemical parameters analysis in surface water samples, collected in Centro Experimental Aramar and surroundings, from 1988 to 2007. The estimated average background radiation concentrations in water samples in this region

Marco Antonio P. V. Moraes; Rosane Correa Fagundes



Incidencia de faringoamigdalitis y otitis media de pacientes que asistieron al centro de salud de Boca Canasta  

Microsoft Academic Search

Pharyngotonsillitis is an inflammatory syndrome of the tonsils caused most of the times by a virus. The otitis media is a persistent inflammation of the middle ear's mucosa; associated with Pharyngotonsillitis in kids. A prospective study was done with the purpose of knowing the incidence of Pharyngotonsillitis and Otitis Media in all the seen patients in the Centro de Salud

Manuel Díaz; César Fernández; Jacobo Peña; Yanel Perez; Alexandra Féliz Camilo



Microsoft Academic Search

This paper presents and discusses the experience in setting up distance learning in the undergraduate courses level at UNISAL (Centro Universitário Salesiano de São Paulo). The purpose of creating proceedings and orientations is to contribute to the establishment of an institutional culture through the Distance Learning Construction Program. It was considered that the distance learning alternative mediated by computers is

Maria L. Tarcia; Anderson Luiz Barbosa; Renato Kraide Soffner


Accelerator-based research activities at “Centro Nacional de Aceleradores”, Seville (Spain)  

NASA Astrophysics Data System (ADS)

In February 1998, almost 10 years ago, the set-up of the first IBA (ion beam analysis) facility in Spain took place with the arrival of a 3 MV tandem accelerator [J. García-López, F.J. Ager, M. Barbadillo-Rank, F.J. Madrigal, M.A. Ontalba, M.A. Respaldiza, M.D. Ynsa, Nucl. Instr. and Meth. B 161 163 (2000) 1137]. Since then, an intensive research program using IBA techniques has been carried out. Subsequently, a cyclotron for 18 MeV protons has been also installed at the “Centro Nacional de Aceleradores” (CNA), devoted mainly to isotope production for PET (positron emission tomography) techniques, but possibly applied to material analysis and damage studies on a dedicated beam line. Moreover, a 1 MV tandem has been recently installed for AMS (accelerator mass spectrometry) 14C dating and environmental research with other isotopes. In the present paper we describe the new facilities and the developments of the 3 MV tandem beam lines occurred during the past years, as well as some examples of the most recent research activities in our Center in the fields of Material Science, Archaeometry, Biomedicine and Environment.

Respaldiza, M. A.; Ager, F. J.; Carmona, A.; Ferrer, J.; García-León, M.; García-López, J.; García-Orellana, I.; Gómez-Tubío, B.; Morilla, Y.; Ontalba, M. A.; Ortega-Feliu, I.



Design of a Heliostat for Centro de Investigaciones de Astronomía (CIDA)  

NASA Astrophysics Data System (ADS)

This paper explains the procedure used in the design of a heliostat to be installed at the headquarters of the Centro de Investigaciones de Astronomía, located in the city of Mérida, Venezuela. The heliostat will be used mainly for educational and public outreach programs, so the design specifications did not require compensation for rotation of the Sun's image at the focal point. The engineering computational tools CAD-CAE were used in order to allow a seamless interaction between the two disciplines involved, Mechanical Engineering and Astronomy. It has also been taken into consideration, as a starting requirement, that all materials be easily available and that all parts, excluding the optics, could be manufactured with the equipment available at the CIDA workshop. These considerations were intended to reduce the cost of the device and to increase the feasibility of construction with limited technological facilities and financial resources. The results obtained by means of the computing tools used were validated through comparison against the analytical calculations. As a result, a robust but low cost heliostat was designed which in the near future will be used to project the Sun's image on a screen for public viewing and student research projects.

Dávila, L. E.; Barboza, S. J.; Sánchez, G. A.; Della Prugna, F.; Cova, J.; Provenzano, S. E.; Chacón, R. D.



Dipole reversal: an ictal feature in a patient with benign partial epilepsy of childhood with centro-temporal spike.  


We describe the case of a 15-year-old boy who had the diagnosis of benign partial epilepsy of childhood with centro-temporal spike. During the EEG a subclinical electrographic seizure was recorded. The discharges were clearly electropositive in T4 with positive phase reversal between derivations F8-T4 and T4-T6. The whole episode lasted less than one minute (45 sec). The interictal right medio-temporal spikes reemerged after 60 sec and were electronegative in the same location after the end of the electrographic seizures. The mechanisms underlying this uncommon pattern on EEG is not well established. PMID:7487536

Silva, D F; Lima, M M; Anghinah, R; Zanoteli, E; Lima, J G




Microsoft Academic Search

The emergency mobile seismic network (RPI) is a structure that belongs to the Centro Nazionale Terremoti (INGV), and allows, in case of seismic event, to increase the number of seismic stations in the epicentral area. The peculiarity of this structure is the possibility to transmit the data flow in real-time to the acquisition center. The RPI is constituted by nine



Fortaleza’s Feminisms: Searching for Feminist Theory in the Centro de Referência da Mulher and the Delegacia de Defesa da Mulher  

Microsoft Academic Search

This study attempts to focus on the issue of how violence against women is combated in Brazil through interviewing the women who work at the Delegacia de Defesa da Mulher and the Centro de Referência da Mulher. I attempt to compare and contrast the policies and procedures of these two institutions, as well as the opinions of the women who

Paige Sweet



City of El Centro geothermal energy utility core field experiment. Final report, February 16, 1979-November 30, 1984  

SciTech Connect

The City of El Centro was awarded a contract in late 1978 to cost share the development of a low to moderate temperature geothermal resource in the City. The resource would be utilized to heat, cool and provide hot water to the nearby Community Center. In December 1981, Thermal 1 (injector) was drilled to 3970 feet. In January 1982, Thermal 2 (producer) was drilled to 8510 feet. Before testing began, fill migrated into both wells. Both wells were cleaned out. A pump was installed in the producer, but migration of fill again into the injector precluded injection of produced fluid. A short term production test was undertaken and results analyzed. Based upon the analysis, DOE decided that the well was not useful for commercial production due to a low flow rate, the potential problems of continued sanding and gasing, and the requirement to lower the pump setting depth and the associated costs of pumping. There was no commercial user found to take over the wells. Therefore, the wells were plugged and abandoned. The site was restored to its original condition.

Province, S.G.; Sherwood, P.B.



Comunicación y participación política  

Microsoft Academic Search

El libro Comunicación y Participación Política, resultado de las actividades académicas desarrolladas por el Centro de Investigación en Comunicación Política de la Facultad de Comunicación Social del Externado en sus tres primeros años de funcionamiento, con el apoyo de la Universidad de Wisconsin-Madison y sus centros para la Comunicación y la Democracia y para el estudio de Latinoamérica, el Caribe

Irma B. Pérez; Dhavan V. Shah; Lewis A. Friedland; Ana María Miralles; Hernando Rojas; Eulàlia Puig-i-Abril


CONFERENCE NOTE: CETO—Centro de Ciências e Tecnologias Opticas, Trends in Optical Fibre Metrology and Standards  

NASA Astrophysics Data System (ADS)

Summer School, 27 June to 8 July 1994, Viana do Castelo, Hotel do Parque, Portugal Optical fibres, with their extremely low transmission loss, untapped bandwidth and controllable dispersion, dominate a broad range of technologies in which applications must respond to the increasing constraints of today's specifications as well as envisage future requirements. Optical fibres dominate communications systems. In the area of sensors, fibre optics will be fully exploited for their immunity to EMI, their high sensitivity and their large dynamic range. The maturity of single mode optical technology has led to intensive R&D of a range of components based on the advantages of transmission characteristics and signal processing. Specifications and intercompatibility requests for the new generation of both analogue and digital fibre optical components and systems has created a demand for sophisticated measuring techniques based on unique and complex instruments. In recent years there has been a signification evolution in response to the explosion of applications and the tightening of specifications. These developments justify a concerted effort to focus on trends in optical fibre metrology and standards. Objective The objective of this school is to provide a progressive and comprehensive presentation of current issues concerning passive and active optical fibre characterization and measurement techniques. Passive fibre components support a variety of developments in optical fibre systems and will be discussed in terms of relevance and standards. Particular attention will be paid to devices for metrological purposes such as reference fibres and calibration artefacts. The characterization and testing of optical fibre amplifiers, which have great potential in telecommunications, data distribution networks and as a system part in instrumentation, will be covered. Methods of measurement and means of calibration with traceability will be discussed, together with the characterization requirements of the new generation of analogue and digital fibre optical systems, which require sophisticated measurement techniques employing complex instruments unique to optical measurements. The school will foster and enhance the interaction between material, devices, systems, and standards-oriented R&D communities, as well as between engineers concerned with design and manufacturers of systems and instrumentation. Topics Review of optical fibre communication technology and systems Measurement techniques for fibre characterization: Reliability and traceability Reference fibres and calibration artefacts Ribbon fibres Mechanical and environmental testing Fibre reliability Polarimetric measurements Passive components characterization: Splices and connectors Couplers, splitters, taps and WDMs Optical fibres and isolators WDM technologies and applications: WDM technologies Tunable optical filters Fibre amplifiers and sources: Performances and characterization Design and standards Nonlinear effects Subsystem design and standards: Design and fabrication techniques Performance degradation and reliability Evaluation of costs/performance/technology Sensors IR - optical fibres Plastic fibres Instrumentation Registration Participation free of charge for postgraduate students, with some grants available for travel and lodging expenses. All correspondence should be addressed to: Secretariat, Trends in Optical Fibre Metrology and Standards, a/c Prof. Olivério D D Soares, Centro de Ciências e Tecnologias Opticas, Lab. Fisica - Faculdade de Ciências, Praça Gomes Teixeira, P-4000 Porto, Portugal. Tel: 351-2-310290, 351-2-2001648; Fax: 351-2-319267.



Factors associated with failure of clinical screening among blood donors who have altered serological results in the Centro Regional de Hemoterapia de Ribeir?o Preto  

PubMed Central

Objective This study aimed to investigate the frequency of positive results for hepatitis B and C, HIV and syphilis in blood donations at the Centro Regional de Hemoterapia de Ribeirão Preto, to describe donors with positive results according to some demographic and socioeconomic variables, to identify risk factors associated to these donors and the reasons that they were not detected during clinical screening. Methods A descriptive study was performed between July 1st 2005 and July 31st 2006 by interviewing 106 donorsafter medical consultations where they were informed of positive results for hepatitis B, hepatitis C, HIV or syphilis. Results There was a predominance of first-time donors, males, under 50-year olds, married individuals, from Ribeirão Preto, with elementary education, low economic status and of people who donated at the request of friends or relatives. Hepatitis C was the most frequently detected infection (56.6%), followed by hepatitis B (20.7%), HIV (12.3%) and syphilis(10.4%). About 40% of donors had omitted risk factors for different reasons: because they trusted the results of serological tests, did not feel comfortable about talking of risk factors or did not consider them relevant. Other justifications were the duration of the interview, the interviewer was unskilled, embarrassment and doubts about confidentiality. Conclusion The results indicate the need for changes in the approach to clinical screening and a review of methods to attract and guide potential donors.

Ferreira, Oranice; Passos, Afonso Dinis Costa



The new emergency structure of the Istituto Nazionale di Geofisica e Vulcanologia during the L’Aquila 2009 seismic sequence: the contribution of the COES (Seismological Emergency Operation Center - Centro Operativo Emergenza Sismica)  

NASA Astrophysics Data System (ADS)

The Centro Nazionale Terremoti (CNT - National Earthquake Center), departement of Istituto Nazionale di Geofisica e Vulcanologia (INGV), has designed and setup a rapid response emergency structure to face the occurrence of strong earthquakes. This structure is composed by a real time satellite telemetered temporary seismic network (see Abruzzese et al., 2009 Fall AGU) used to improve the hypocentral locations of the INGV National Seismic Network, a stand alone temporary seismic network whose goal is primarily the high dynamic/high resolution data acquisition in the epicentral area and a mobile operational center, the COES (Centro Operativo Emergenza Sismica, Seismological Emergency Operational Center). The COES structure is a sort of mobile office equipped with satellite internet communication that can be rapidly installed in the disaster area to support all the INGV staff operative needs and to cooperate with the Civil Protection department (DPC) aggregating all the scientific information available on the seismic sequence and providing updated information to Civil Protection for the decision making stage during the emergency. The structure is equipped with a heavy load trolley that carries a 6x6 inflatable tent, a satellite router, an UPS, computers, monitors and furniture. The facility can be installed in a couple of hours in the epicentral area and provides a full featured office with dedicated internet connection and VPN access to the INGV data management center in Rome. Just after the April 6 2009 Mw 6.3 earthquake in L’Aquila (Central Italy) the COES has been installed upon request of the Italian Civil Protection (DPC) in the DICOMAC (Directorate of Command and Control - which is the central structure of the DPC that coordinates the emergency activities in the areas affected by the earthquake) located in the Guardia di Finanza headquarters in Coppito nearby L'Aquila (the same location that hosted the G8 meeting). The COES produces real time reports on the seismic sequence evolution constituted by a detailed sequence map, histograms showing the evolution of the magnitude and the number of earthquakes in time and a daily event list. Moreover, it is possible to see the real time hypocentral locations using “SISMAP” (Doumaz et al., 2008), the same tool used in the Seismic Monitoring Center in Rome. During the emergency the COES has been also a reference information point for all people involved in the crisis management and has provided also psychological support to the rescuers and to the earthquake affected population. This education and outreach activity has proved to be extremely effective. References Abruzzese L. et al., AGU Fall Meeting 2009. Doumaz F. et al., Geomedia, speciale geologia, pp. 10-13, 2008.

Moretti, M.; Govoni, A.; Nostro, C.; La Longa, F.; Crescimbene, M.; Pignone, M.; Selvaggi, G.; Working Group, C.



Final report on EURAMET.T-K3.3: Report on the comparison of the realizations of the ITS-90 over the range 83.8058 K to 933.473 K between Centro Español de Metrología (CEM) and Laboratorio Costarricense de Metrología (LACOMET)  

NASA Astrophysics Data System (ADS)

A bilateral comparison between Centro Español de Metrología (CEM), Spain, and Laboratorio Costarricense de Metrología (LACOMET), Costa Rica, in the range 83.8058 K to 993.473 K has been developed during 2009 aimed at providing linkage of LACOMET results to those of the CCT key comparisons CCT-K3 and CCT-K4. The participation of CEM in the EURAMET regional key comparisons EUROMET.T-K3 and EUROMET.T-K4 is the basis of the link. This report presents the results of this comparison, provides detailed information of the measurements performed by the participating laboratories, and links the comparison results to the CCT and EURAMET related comparisons. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database The final report has been peer-reviewed and approved for publication by the CCT, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

del Campo, Dolores; Solano, Adrián



Variable Concord in Sentential Plural Marking. Centro Working Papers 6.  

ERIC Educational Resources Information Center

This study examines the interaction between the deletion of the nominal plural marker and the verbal plural marker in Puerto Rican Spanish. It seeks to establish whether: (1) marker deletion in the noun phrase and marker deletion in the verb phrase specifically constrain each other, or (2) the system of local concord noted for the noun phrase…

Poplack, Shana


Recent Activities at Centro Informazioni Studi Esperienze Tandem.  

National Technical Information Service (NTIS)

Installation improvements in a radiation damage, PIXE, and backscattering analysis laboratory are described; in particular the 3.5 MV CISE Tandem computer control center which is based on a S130 Eclipse central controller and Z80A microprocessor local con...

E. Caruso F. Cristofori



Infección respiratoria aguda en niños que acuden a un centro de desarrollo infantil  

Microsoft Academic Search

Objective. To assess the incidence of acute respiratory in- fections and bacterial colonization in children attending a daycare center. Material and Methods. A cohort study was conducted from April to Octuber 1999, among 85 chil- dren aged under four years, who attended the daycare center at Hospital Infantil de Mexico (Mexico City's Children's Hospital) \\

Eugenia Nandí-Lozano; Luz Elena Espinosa; Lucía Viñas-Flores; Carlos Avila-Figueroa



Experimental Research with a Shock Tube of the Centro Studi Sulla Dinamica Dei Fluidi.  

National Technical Information Service (NTIS)

The experiments carried out with a shock tube are described as shock speed, wall temperature, and heat flux, pressure measurements. Particularly emphasized was the description of some original results on the behaviour of a metallic probe in a stream of hi...

A. Romiti



La Communicacion entre los Centros de Investigacion en Educacion (Communication among Educational Research Centers).  

ERIC Educational Resources Information Center

|In Latin America there is a lack of communication concerning educational research. This lack has been underlined in many regional meetings, but no action has been taken. Possible steps that would lead to improvement include circulation of research summaries, both for completed and current works, efforts by research centers to organize meetings,…

Schiefelbein, Ernesto



Activities report of the Centro Studi E Laboratori Telecomunicazioni: Reports and balances  

NASA Astrophysics Data System (ADS)

The CSELT management report on structure and activities covers public and ISDN (Integrated Services Digital Network) networks, intelligence and service networks, mobile services, management of OSS (Operation Support Systems) and networks, high-speed networks and services, optical networks and systems, radio points and satellites, and duality and conformity tests. Management progress, investments, personnel, participation in European projects, and collaboration with Italian universities are outlined. An analysis of income results and of the patrimonial and financial situations is given. Balances at 31 Dec. 1990 are shown.



CIMMYT (Centro Internacional de Mejoramiento de Maiz y Trigo) Report on Wheat Improvement 1984.  

National Technical Information Service (NTIS)

CIMMYT, the International Maize and Wheat Improvement Center, has a mandate to develop improved germplasm and make the material available throughout the world, especially to developing countries. In the report, progress and results are presented for CIMMY...




Microsoft Academic Search

This paper ia cut-off of the qualitative phase of evaluation research a Psycho-social Support Centers, in southern Brazilian. It represents a case study carried out in the city of São Lourenço do Sul, RS, Brazil. It aims to represent the insertion of families in the Psycho-social Support Centers from the point of view of interest groups, users, relatives, and staff.

Valquíria de Lourdes; Machado Bielemann; Luciane Prado Kantorski; Luana Ribeiro Borges; Rita Maria Heck



Valutazione dello stress lavoro correlato nei lavoratori di un centro commerciale  

Microsoft Academic Search

ASSESSMENT OF OCCUPATIONAL STRESS AMONG SHOPPING CENTRE EMPLOYEES. Occupational stress literature emphasizes the importance of assessment and management of work related stress. The recognition of the harmful physical and psychological effects of occupational stress on both individuals and organizations is widely studied in Europe. In Italy such legislation was introduced by Legislative Decree 81\\/2008. Objective of the present study was

C. Feng; C. Di Nola; P. Maviglia; A. Cacciola; C. Nardella



Dinamiche di sviluppo nel centro e nella periferia d'Europa: il ruolo delle politiche strutturali  

Microsoft Academic Search

In spite of the huge amount of public aids to poor regions, relative movements in the distribution of income, labor productivity and employment rates across European regions show no positive relation with the distribution of the Structural Funds. Remarkable exceptions, however, do exist. This work investigates the core\\/periphery pattern in the European Union and carries out a comparative analysis of

Roberto Basile; Sergio De Nardis; Alessandro Girardi



Reducción y reciclaje de residuos sólidos urbanos en centros de educación superior: Estudio de caso  

Microsoft Academic Search

The municipal waste generated by CINVESTAV-Mérida was characterized for a period of three years. The municipal solid waste was composed of 48 % organics; 20% cardboard and paper; 8 % soft drinks or purified water plastic bottles (polyethylene terephthalate, PET) and diverse plastics; 5 % glass bottles or containers and broken laboratory glass; 2 % aluminium cans, and 17 %

L. Maldonado



Renewable Energy for Rural Health Clinics (Energia Removable para Centros de Salud Rurales).  

National Technical Information Service (NTIS)

This guide provides a broad understanding of the technical, social, and organizational aspects of health clinic electrification, especially through the use of renewable energy sources. It is intended to be used primarily by decision makers within governme...

A. C. Jimenez K. Olson



Renewable Energy for Rural Health Clinics (Energia Removable para Centros de Salud Rurales)  

Microsoft Academic Search

This guide provides a broad understanding of the technical, social, and organizational aspects of health clinic electrification, especially through the use of renewable energy sources. It is intended to be used primarily by decision makers within governments or private agencies to accurately assess their health clinic's needs, select appropriate and cost-effective technologies to meet those needs, and to put into

A. C. Jimenez; K. Olson



Energia Renovable para Centros de Salud Rurales (Renewable Energy for Rural Health Clinics)  

Microsoft Academic Search

Esta es la primera de una serie de guias de aplicaciones que el Programa de Energia de Villas de NREL esta comisionando para acoplar sistemas comerciales renovables con aplicaciones rurales, incluyendo agua, escuelas rurales y micro empresas. La guia esta complementada por las actividades de desarrollo del Programa de Energia de Villas de NREL, proyectos pilotos internacionales y programas de

T. Jimenez; K. Olson



Boletin Del Centro De Documentacion E Informacion Pedagogica (Bulletin of the Documentation and Teaching Information Center).  

ERIC Educational Resources Information Center

A series of speeches and activities sponsored by the Buenos Aires Ministry of Education are presented. This presentation consists of four sections. The first, focusing on 1970 as International Education Year, contains four speeches. Next, Documentation Services, particularly teaching documentation, are examined. Following this, Section 3 discusses…

Ministry of Education, Buenos Aires (Argentina).



Microsoft Academic Search

RESUMEN Este trabajo analiza los patrones de distribución y abundancia de las comunidades invernales de micromamíferos de dos áreas agrícolas de España central. Ambas áreas están constituidas por encinares Quercus ilex relictos y fragmentados dentro de una matriz agrícola. Los micromamíferos se muestrearon empleando trampas de foseta que estuvieron abiertas durante un ciclo lunar completo (28 noches en febrero-marzo de




Sistemas de producción de Spondias purpurea (Anacardiaceae) en el centro-occidente de México  

Microsoft Academic Search

Production systems of Spondias purpurea (Anacardiaceae) in Central West México. Morphological, physical and chemical traits related with fruit quality characteristics of Spondias purpurea L. agroecosystems were studied in Central-West Mexico for wild and cultivated populations. Spondias purpurea regularly thrive in shallow, rocky infertile soils unsuitable for conventional crops. The weight, axial and radial length, pH, total soluble solids (SST), reducing

Blanca C. Ramírez Hernández; Pimienta Barrios Eulogio; Javier Z. Castellanos Ramos; Alejandro Muñoz Urias; Guadalupe Palomino Hasbach; Enrique Pimienta Barrios



Consumo de drogas en mujeres asistentes a centros de tratamiento especializado en la Ciudad de México  

Microsoft Academic Search

The most frecuently consumed drugs once in a lifetime were: tobacco (89.3%), alcoholic drinks (77.3%), marijuana (30.4%), crack (18.4%), cocaine hydrochloride (17.0%) and solvents and removers (15.4%). During the last year of use they were: tobacco (82.9%), alcoholic drinks (65.6%), marijuana (19.4%), crack (15.3%), cocaine hydrochloride (10.9%) and solvents and removers (10.1%). During the last month of use they were:

P. Isaías; Castillo Franco; Alma Delia; Gutiérrez López


Energia Renovable para Centros de Salud Rurales (Renewable Energy for Rural Health Clinics)  

SciTech Connect

Esta es la primera de una serie de guias de aplicaciones que el Programa de Energia de Villas de NREL esta comisionando para acoplar sistemas comerciales renovables con aplicaciones rurales, incluyendo agua, escuelas rurales y micro empresas. La guia esta complementada por las actividades de desarrollo del Programa de Energia de Villas de NREL, proyectos pilotos internacionales y programas de visitas profesionales.

Jimenez, T.; Olson, K.



Renewable Energy for Rural Health Clinics (Energia Removable para Centros de Salud Rurales)  

SciTech Connect

This guide provides a broad understanding of the technical, social, and organizational aspects of health clinic electrification, especially through the use of renewable energy sources. It is intended to be used primarily by decision makers within governments or private agencies to accurately assess their health clinic's needs, select appropriate and cost-effective technologies to meet those needs, and to put into place effective infrastructure to install and maintain the hardware. This is the first in a series of rural applications guidebooks that the National Renewable Energy Laboratory (NREL) Village Power Program is commissioning to couple commercial renewable systems with rural applications. The guidebooks are complemented by NREL's Village Power Program's development activities, international pilot projects, and visiting professionals program. For more information on the NREL Village Power Program, visit the Renewables for Sustainable Village Power web site at .gov/rsvp/.

Jimenez, A. C.; Olson, K.



Violencia sexual y problemas asociados en una muestra de usuarias de un centro de salud  

Microsoft Academic Search

Objective. To estimate the frequency of different forms of sexual violence and its association with mental health problems, such as depressive symptoms, suicidal ideation and attempt, and alcohol and drug use. Material and meth- ods. From February to March 1998, a cross-sectional study was conducted among 345 women attending a healthcare center in Mexico City. All women were living with

Luciana Ramos-Lira; María Teresa Saltijeral-Méndez; Martha Romero-Mendoza; Miguel Angel Caballero-Gutiérrez; Nora Angélica Martínez-Vélez



The acoustic design of the Centro Nacional de las Artes in Mexico City  

NASA Astrophysics Data System (ADS)

In this paper the acoustic design of the separate buildings housing the school of music, school of drama, and school of dance that opened in 1996 will be described. Spaces that JHA designed included practice rooms, studios, rehearsal rooms, black box, and concert hall. Details of room acoustic treatments, sound isolation measures, and venturi air flow will be illustrated. An overview of the entire project will also include the 500 seat multipurpose theater (with variable absorption systems) and the Alla Magna. Differences between the American and Mexican styles of consulting, importing of materials, installation, and commissioning will also be discussed.

Cooper, Rusell



The Centro American Hemophilia Registry, of the CARS Hemophilia Group — Update September 2006  

Microsoft Academic Search

Hemophilia A (HA) and B (HB) are X-linked recessive bleeding disorder caused by absence or deficiency of coagulation factor\\u000a VIII or IX, respectively. The possibilities of diagnosis and treatment of hemophilia vary in different countries. Concerning\\u000a these two points World Federation of Hemophilia (WFH) divides countries in two groups: develop and developing countries. Central\\u000a America (CA) countries: Guatemala, Salvador, Honduras,

L. Salazar-Sanchez; G. Mancia de Reyes; B. Moreno; S. Torselli; M. J. Lopez; R. Berrios; O. J. Perez; G. Jiménez-Cruz; M. Cartin; M. Navarrete; V. Ramos


Well test plan for the City of El Centro utility core field experiment  

SciTech Connect

The following are included in the well test plan: well test program schedule and order of work; the injection well drilling program details; the production well drilling program details; and long-term (30-day) production testing program details. (MHR)

Not Available



Arquitetura e desempenho luminoso: CENPES II, o novo centro de pesquisas da Petrobras, no Rio de Janeiro, Brasil  

Microsoft Academic Search

Tel.: (11) 3091-4681 E-mail: This paper presents the results of the performance evaluation in terms of daylighting of the Petrobras New Research Centre (CENPES II) building design in the tropical climate of Rio Janeiro, Brazil, under a typical partially cloudy and bright sky. The architectural design encompasses an área over 100,000 m2, distributed among ten new buildings. According to

Norberto Corrêa; Silva Moura; Anna Christina Mian; Denise Helena Silva Duarte; Norberto Corrêa da Silva


Frecuencia de diagnósticos de la especialidad de otorrinolaringología en el consultorio de medicina general en un centro de salud  

Microsoft Academic Search

SUMMARY Objective: To determinate the frequency of diagnostics by specialty in outpatients in general practice and to describe the more frequent diagnostics in otolaryngology. Material and Methods: Descriptive, transversal study. The frequency of diagnostics by specialty and in otolaryngology at general practitioners consulting room was determined between June and September 2002. The diagnostics were consigned by the international codification (ICE-10).





Microsoft Academic Search

The objective of this study is the construction and estimation of an analytical model which is able to explain the behavior of prices of products from the sugar and alcohol industries, taking into account the recent interrelationship observed between these sectors and the fossil fuel products when the hydrated alcohol has been considered a substitute for the C-gasoline. The methodology

Mirian Rumenos Piedade Bacchi



The experience collected in the management of the Centro Informazioni Studi Esperienze (CISE) radioactive waste from 1960 to 1980  

NASA Astrophysics Data System (ADS)

The radioactive waste produced in a research center, its processing and destination are described. The radioactive waste is mainly solid (26 cu m) or inorganic liquid (65 cu m), although some paste (3 cu m) and organic liquids (0.1 cu m) were also produced. The disposal in each material category is described, including a block diagram of the liquid radioactive waste treatment plant. A time table shows that at the end of the period the stock of radioactive waste was reduced to 10 cu m.

Triulzi, C.; Carifi, N.


Dinamica del Reactor TRIGA Mark III del Centro Nuclear de Mexico. (Dynamics of TRIGA-3 Salazar Reactor.).  

National Technical Information Service (NTIS)

The theoretical study of temporal behavior of a nuclear reactor is of great importance, since it allows to know, in advance, the conditions to which a reactor is going to be submitted. The reliability of two computer codes (AIREK-JEN and PLANKIN) designed...

L. F. Gallardo



El sexo recompensado: una práctica en el centro de las vulnerabilidades (ITS\\/VIH\\/SIDA) de las jóvenes mexicanas  

Microsoft Academic Search

Objective. To discuss the risks for Mexican young women who engage in sexual relations in exchange for social or economic benefits, also known as compensated sex (CS), with the objective of exploring its possible public health implications. Material and Methods. This is a qualitative study conducted in youths 15 to 25 years of age in Cuerna- vaca, Morelos, Mexico, between

Florence Lise Théodore; Juan Pablo Gutiérrez; Pilar Torres; Gabriela Luna



Composición y propiedades cerámicas de las pizarras de la Zona Centro Ibérica del Macizo Ibérico Meridional (Norte de Jaén, España)  

Microsoft Academic Search

Composition and ceramic properties of shales from the Central-Iberican Zone of Southern Iberian Massif (Northern Jaen, Spain) The suitability of shale materials from the Iberian Massif in the Jaén province (Spain) to make ceramic materials has been eva- luated. The main components of these shales are illite, kaolinite, quartz and feldspars, with lesser amounts of chlorite, pyro- phyllite, paragonite and




Microsoft Academic Search

Suicide risk in prison is a important theme of penitentiary politics agenda, because prisoners suicide rates are frequently highers than in general population. In according to research, suicide behaviors are more frequents in youth prisoners, drug abusers, people with previous mental diseases, but not with depression. Also, both legal process difficulties and imprisonment variables are risk factors of self-damage, like

José Ignacio Ruiz; Ingrid Gómez; Mary Luz Landazabal; Sully Morales; Vanessa Sánchez; Darío Páez; Revista Colombiana de Psicología



Dinámica del Desempeño Académico  

Microsoft Academic Search

Este trabajo se ocupa del progreso, luego del ingreso, de los estudiantes de la cohorte 2000 de la Facultad de Ciencias Económicas de la Universidad Nacional de La Plata. Si bien hay antecedentes de medición del rendimiento de los estudiantes de la Facultad y sus factores explicativos, se trata de estudios realizados en base a encuestas a alumnos regulares en

Luciano Di Gresia; Alberto Porto



Geologic Survey in the South-Central Region of Mato Grosso Caminhamento Geologico NA Regiao Centro-Sul de Mato Grosso.  

National Technical Information Service (NTIS)

The field observations made in the Cuiaba Project area are described. Many geologic cross-sections were done in which the stratigraphic units and the geologic structures defined in the literature and observed in the LANDSAT MSS imagery were recognized.

N. D. J. Parada M. G. Balieiro



Reproducibility of coronary optical coherence tomography for lumen and length measurements in humans (The CLI-VAR [Centro per la Lotta contro l'Infarto-VARiability] study).  


Frequency-domain optical coherence tomography (FD-OCT) is becoming a useful diagnostic tool for coronary imaging for quantitative coronary analysis. Second-generation FD-OCT produces detailed coronary lumen images. However, the reproducibility of coronary measurements using FD-OCT in humans has not been thoroughly explored. Our goal was to determine the intraobserver, interobserver, and interpullback reproducibility of the in vivo FD-OCT measurements of the lumen area and/or lesion length. Twenty-five patients undergoing coronary angioplasty were included. In all subjects, FD-OCT pullbacks (20 mm/s) were acquired twice from the same coronary segment different from the target lesion, at an interval of 5 minutes, with no other intervention. A total of 9,396 cross-sectional lumen area frames and the relative coronary lesion length of each pullback were analyzed off-line with dedicated software by 2 independent expert readers (A and B). We compared the lumen area and length measurements as follows: pullback 1, read by reader A twice at an interval of 7 days (intraobserver analysis); pullback 1, independently read by readers A and B (interobserver comparison); and pullback 1 versus pullback 2, read by reader A (interpullback comparison). The per-segment and per-frame analyses showed very high and significant correlation coefficients for the interobserver, intraobserver, and interpullback comparisons for the lumen area and lesion length (R ?0.95 and p <0.001 in all cases). Accordingly, the Bland-Altman estimates of bias showed nonsignificant differences in the interobserver, intraobserver, and interpullback comparisons at all levels, with average biases never >0.150 mm(2) for the lumen area or 0.200 mm for the lesion length. In conclusion, coronary imaging using FD-OCT showed excellent reproducibility, with low intraobserver, interobserver, and interpullback variability for both lumen area and lesion length measurements in humans. Thus, FD-OCT can be proposed for precise analysis in the catheterization laboratory to guide decision making and in clinical trials focusing on imaging end points. PMID:22748353

Fedele, Silvio; Biondi-Zoccai, Giuseppe; Kwiatkowski, Piotr; Di Vito, Luca; Occhipinti, Michele; Cremonesi, Alberto; Albertucci, Mario; Materia, Laura; Paoletti, Giulia; Prati, Francesco




Microsoft Academic Search

The physical activity is a form to more improve each time the quality of life of the people, then the gym is synonymous of guided physical activity, serching to after for its practioners a service where at can, in the possible measure do, to take care of its expectations, and this study it had the objective to discover the reasons

Cristina Lúcia; Fernandes A. Albuquerque



Microsoft Academic Search

EMENTA Contexto histórico e motivação para o surgimento das redes. Critérios de implementação e comparação de redes. Classificação das redes quanto às topologias, área de cobertura. Modelos de Referência de redes: OSI e TCP\\/IP. Questões relacionadas a projeto, implantação e administração de redes de computadores. Rede windows ponto a ponto. Linux: comandos básicos, interface gráfica e instalação.



Centro Nazionale Influenza. Sorveglianza Virologica dell'Influenza in Italia. Stagione 2003-2004. Rapporto Preliminare. (National Influenza Centre. Virological Influenza Surveillance in Italy. 2003-2004 Season.)  

National Technical Information Service (NTIS)

Influenza is an acute respiratory illness. It occurs all over the world and causes considerable morbidity and mortality every year. Vaccination is one of the main influenza prevention methods. Due to the constantly changing composition of the influenza vi...

E. Donatelli S. Puzelli C. Affinito C. Fabiani




Microsoft Academic Search

SUMMARY Introduction. Depression is one of the leading causes of disease and disability in the world. Yet, most cases of depression are ignored by the community or even at certain levels of the health care system. Thus, medical care is delayed, a fact that has a negative impact on public health and on socioeconomical conditions. In this context, screening instruments

Mónica Reyes-Ortega; Ana Laura Soto-Hernández; Jessyka G. Milla-Kegel; Adriana García-Ramírez; Lucía Hubard-Vignau; Lydia A. Mejía-Garza; Ma Carmen García-Peña; Fernando A. Wagner-Echeagaray



OBSERVACIONES PRELIMINARES DE LA FLUCTUACIÓN ESTACIONAL DE Haematobia irritans EN EL CENTRO DE MÉXICO Preliminary Observations on the Seasonal Fluctuation of Haematobia irritans in Central Mexico  

Microsoft Academic Search

The objective of this study was to determine the seasonal fluctuation of Haematobia irritans (L) in a temperate area of Mexico. It was carried out by weekly counts of horn flies on grazing Holstein cows from September 6, 1997 to August 29, 1998. Horn fly counts were correlated with seven weather variables for the four previous weeks to counts. Flies

Ema Maldonado Simán; Ricardo Améndola Massiotti; José Artemio Cadena Meneses; Luis Bermúdez Villanueva; Sydney E. Kunz



ARTURA, Tecnologia per l’arte e la natura. Le tecnologie ICT e multimediali per la valorizzazione dei beni culturali di un piccolo centro (in Italian)  

Microsoft Academic Search

Il progetto ha puntato a realizzare il sistema ARTURA, un sistema\\u000a\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009basato sulle più moderne tecnologie dell’informazione e della comunicazione\\u000a\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009(ICT) e multimediali, che consenta di valorizzare i luoghi di interesse\\u000a\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009storico, artistico, culturale ambientale e paesaggistico dei piccoli\\u000a\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009centri. E’ stato sperimentato nel corso dell’anno 2010 nel Comune\\u000a\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009\\u0009di Affile (RM), che ha ritenuto le azioni e gli interventi

L. Basset; R. Besson; G. Orlandi; M. Panella



Áreas con potencial para el establecimiento de árboles forrajeros en el centro de Chiapas Potential areas for establishment of forage trees in central Chiapas, Mexico  

Microsoft Academic Search

Forage tree species in central Chiapas, Mexico, were geographically located, their foliage nutritionally analyzed and their locations edaphoclimatically characterized to spatially delimit other areas in the region with similar characteristics. Fourteen promising forage tree species were identified at 72 sampling sites in eight transects. The sites' geographic coordinates were taken and used to generate maps of soil and climate conditions

Jaime López Martínezd


Artriti settiche: studio retrospettivo di 12 anni in un unico centro reumatologico* Septic arthritis: a 12 years retrospective study in a rheumatological university clinic  

Microsoft Academic Search

SUMMARY Background: Septic arthritis is a disabling and potentially life-threatening condition that requires prompt diagnosis and treatment. The most important risk factors are joint prosthesis, pre-existing joint disease and immunosuppressive drugs. The aim of our study therefore was to revaluate all septic arthritis cases discharged from our Rheumatologic Unit in the last 12 years, to assess the risk factors, the

M. Favero; F. Schiavon; L. Riato; V. Carraro; L. Punzi


Family Policy in Europe (La Politique Familiale en Europe). Proceedings of the International Symposium of the Centro Internazionale Studi Famiglia (CISF) (Milano, Italy, June 26-29, 1980).  

ERIC Educational Resources Information Center

|Proceedings of the International Symposium on Family Policy in Europe are contained in this document. (Most proceedings are in English, but some are in French, one is in German, and one is in Italian.) Presentations focused basically on family policy within European countries, with attention given to such issues as socialist, noncentralized, and…

Centro Internazionale Studi Famiglia, Milano (Italy).



Microsoft Academic Search

Currently almost all energy is provided by fossil fuels that increase greenhouse gas emissions contributing to global warming. These emissions can be reduced with the use of renewable energy produced from biomass such a livestock manure. The manure is raw material for production of electricity and thermal energy. Anaerobic digestion of waste can reduce emissions by capturing methane, a greenhouse

Bertha Alicia Rivas Lucero; Gabriel Zuniga Avila; Jorge Iram Saenz Solis; Sergio Guerrero Morales; Armando Segovia Lerma; Hugo Armando Morales Morales



[Evolution of Residual Risk for HIV, HCV and HBV, from 1999 to 2010, in Blood Donations of the Centro Hospitalar S. João, EPE, Porto, Portugal].  


Introduction/Objectives: Monitoring the residual risk of transfusion-transmitted viral infections is important to evaluate the improvement achieved in the blood donation safety and to adopt policies to reduce risks. The present study calculates the incidence of the key infectious diseases, human immunodeficiency virus (HIV), hepatitis B virus (HBV) and hepatitis C virus (HCV) as well as the residual risk of transfusion-transmitted viral infections, during twelve years, 1999 through 2010. Data were analyzed over 3 periods of 4 years (1999-2002, 2003-2006 and 2007-2010). The risk estimates were compared to those previously obtained for blood donations occurred between 1991 and 1998. Material and Methods: The study included 209 640 blood donations, from 42 634 regular, volunteers and unpaid donors. The residual risk of transfusion-transmitted infection per million donations was calculated, for each virus, through mathematical model "Incidence rate/window period", described by Schreiber et al. All donations were screened according to Portuguese legislation. In January 2001, the nucleic acid testing in minipool was implemented on all blood donations, for screening simultaneously HIV-1 and HCV ribonucleic acid (RNA) (Cobas Amplicor Ampliscreen-Roche©). This test was replaced, in January 2007, by the simultaneous screening of HBV deoxyribonucleic acid, HCV RNA and HIV-1/HIV-2 RNA, in minipool (Cobas Taqscreen MPX Test-Roche©). Results: The residual risk of transmitting viral infections during the transfusion of blood components is very small and has declined over the years. After the implementation of the nucleic acid testing in minipool for the three viruses, the risk of giving blood during an infectious window period was estimated as follows: for human immunodeficiency virus, 1 in 1.67 million, for hepatitis C virus 1 in 3.33 million and for hepatitis B virus 1 in 526 000. Conclusions: During the 12 years under study, we found a decrease in residual risk for the three viruses, by a factor around five for human immunodeficiency virus and hepatitis B virus, and 32 for hepatitis C virus. If we compare the estimates previously calculated for 1991-1998 period to 2007-2010 period (over 20 years), the decrease is still more relevant with a residual risk of human immunodeficiency virus, hepatitis B virus and hepatitis C virus respectively 19-fold, 6-fold and 54-fold lower. PMID:24016646

Koch, Carmo; Araújo, Fernando



Instituto Nacional de Electrification, Guatemala Load Dispatch Center and Global Communications Center. Feasibility report (Instituto Nacional de Electrificacion, Guatemala Centro Nacional de Despacho de Carga y Sistema Global de Comunicaciones). Export trade information  

SciTech Connect

The report presents the results of a feasibility study for the National Load Dispatch Center and Global Communications System Project in Guatemala. The project consists of a communication system which will provide Institute Nacional de Electrificacion (INDE) operations personnel direct voice access to all major power system facilities. In addition, a modern computer based load dispatch center has been configured on a secure and reliable basis to provide automatic generation control of all major interconnected generating plants within Guatemala.

Not Available



Análisis de los resultados de la inmunización universal a los 12 meses de edad con vacuna de varicela, a través de las consultas externas y las hospitalizaciones en el Centro de Referencia Pediátrico de Uruguay  

Microsoft Academic Search

AimsTo evaluate the incidence of outpatient visits and hospital admissions due to varicella in the Pereira Rossell Hospital Center (CHPR) in the 3 years before and the 3 years after the introduction of routine varicella vaccination at 12 months of age.

J. Quian; P. Dall’orso; C. Romero; A. Cerisola; A. Protasio



Centro Nazionale Oms per l'Influenza: Sorveglianza Virologica Dell'Influenza in Italia (Stagione 2005-2006) (National Influenza Centre: Virological Influenza Surveillance in Italy (2005-2006 Season)).  

National Technical Information Service (NTIS)

Influenza is an acute respiratory illness. It occurs all over the world and causes considerable morbility and mortality every year. Vaccination is one of the main influenza prevention methods. Due to the constantly changing composition of the circulating ...



Sesto Programma Nazionale di Ricerca Sull'AIDS Piano Esecutivo: A Cura del Centro Nazionale AIDS per la Patogenesi e Vaccini Contro HIV/AIDS (National Research Program on AIDS (Sixth): Operational Plan).  

National Technical Information Service (NTIS)

The sixth National Research Program on AIDS is divided in intramural and extramural research projects. The extramural Program is divided as follows: (1) HIV/AIDS Epidemiology; (2) HIV/AIDS Etiopathogenesis and immunological and virological studies; (3) Cl...



Centro Nazionale Influenza. Sorveglianza virologica dell-influenza in Italia (stagione 2001-2002). Rapporto preliminare (National Influenza Center. Virological Influenza Surveillance in Italy (2001-2002 Season). Preliminary Report).  

National Technical Information Service (NTIS)

Influenza is one of the oldest and most common diseases known to man. Every year, the World Health Organization (WHO) brings together international influenza experts to decide the composition of the influenza vaccine for the incoming winter. The influenza...

I. Donatelli C. Affinito C. Fabiani S. Fiaccavento S. Pulzelli



Centro Nazionale Influenza. Sorveglianza Virological dell'Influenza in Italia (Stagione 2004-2005). Rapporto Preliminare (WHO National Influenza Centre. Virological Influenza Surveillance in Italy (2005-2005 Season). Preliminary Report).  

National Technical Information Service (NTIS)

Influenza virus infections are responsible for a highly contagious respiratory disease, which typically results in seasonal epidemics. Vaccination is one of the main influenza prevention methods. Due to the frequent genetic changes of the influenza viruse...

I. Donatelli S. Puzelli C. Affinito L. Calzoletti



Aplicación de un cuestionario de sueño y la escala de somnolencia de Epworth en un centro de salud familiar Application of a sleep questionnaire and the Epworth sleepiness scale in a family health center  

Microsoft Academic Search

Introduction: Sleep disorders, especially sleep breathing disorders, have not been well studied in the patients attending a family health center in Chile. Sleep breathing disorders have been linked to cardiovascular and cerebrovascular diseases, which are important causes of morbidity and mortality. Method: We studied a randomized sample of 180 adult patients (135 women and 45 men, with a mean age

José Luis


Calculo de los parametros fundamentales para el estudio dinamico del reactor Triga Mark-III del Centro Nuclear de Mexico (Nucleo Mixto). (Calculation of fundamental parameters for the dynamical study of TRIGA-3-Salazar reactor (Mixed reactor core)).  

National Technical Information Service (NTIS)

Kinetic parameters for dynamic study of two different configurations, 8 and 9, both with standard fuel, 20% enrichment and Flip (Fuel Life Improvement Program with 70% enrichment) fuel, for TRIGA Mark-III reactor from Mexico Nuclear Center, are obtained. ...

J. Viais J



Nitrogen Fixing Trees for Acid Soils. Proceedings of a Workshop Sponsored by the Nitrogen Fixing Tree Association and the Centro Agronomico Tropical de Investigacion y Ensenanza. Held in Turrialba, Costa Rica on July 3-8, 1994.  

National Technical Information Service (NTIS)

As increasing populations in the tropics are forced to expand agriculture onto acid soils, governments and development organizations will have to devise and encourage low-input technologies for sustainable productivity under difficult, acid soil condition...

D. O. Evans L. T. Szott




Microsoft Academic Search

Based on the structure of the morphological diversity of pepper Capsicum annuum populations from the east-central region of Yucatán, the content of capsaicin and dihydrocapsaicin with high performance liquid chromatograph (HPLC) was assessed in 19 populations of nine morpho-types belonging to C. annuum L., known as Xcat ik (3), Sukurre (1), Ya'x ik (4), Dulce (5), Picopaloma (1) and Chowak

Esmeralda Cázares-Sánchez; Porfirio Ramírez-Vallejo; Fernando Castillo-González; R. Marcos Soto-Hernández; M. Teresa Rodríguez-González; J. Luis Chávez-Servia



El Instituto de Nutrici?n de Centro Am?rica y Panam?: Servicios de Informaci?n Cient?fica en Una Regi?n en V?a de Desarrollo *  

PubMed Central

Pioneering scientific information in underdeveloped areas poses several problems, such as (1) lack of understanding on the part of key functionaries as to the why, what, and when of information services; (2) lack of trained personnel to assume the responsibility for such services; (3) lack of economic resources; and (4) lack of information pertaining to available bibliographical sources in the particular area or region. The Bibliographic and Documentation Service of the Institute of Nutrition of Central America and Panama (INCAP) provides, in addition to the customary services, technical assistance for the organization or reorganization of biomedical libraries and makes INCAP library materials available to member countries, either by loan or photocopy. Although the program was designed for the member countries, INCAP tries to make its services available to other Latin American nations, Africa, and Asia, where similar nutritional problems are being studied.

Flores, Raquel; Corado, Adelina; Giron, Arturo




Microsoft Academic Search

Semi - structured interviews were conducted on 75 rural settlers of the district of Anco during August 2006 aimed at describing relationships between rural settlers and highland carnivores. One hundred percent of those interviewed stated that there is a huge conflict with highland carnivores. The conflict can be traced to economic losses produced by highland carnivores due to predation of

Iris Deustua Aris; Pedro Vásquez Ruesta; León de Castro



Studio di fattibilita' tecnico ed economico per la riqualificazione energetica del centro scolastico di Bertesina 'M. Montessori' (Vicenza). (Technical and economical feasibility study for energy re-qualification of school buildings in Bertesina 'M. Montessori', Vicenza (Italy)).  

National Technical Information Service (NTIS)

Educational buildings have been object of several activities by ENEA (Italian National Agency for New Technology, Energy and Environment), referring to the possibilities of energy saving in accordance with the comfort and the hygiene regulations provided ...

M. Michelini M. Minischetti R. Parutto M. T. Porfiri F. Trevisan



Perfil Demográfico dos Pacientes Atendidos no Centro de Controle da Dor Orofacial da Faculdade de Odontologia de Pernambuco Demographic Profile of Patients Attended at the Orofacial Pain Control Center of the Dental School of the University of Pernambuco  

Microsoft Academic Search

Objective: To describe the profile of patients who were referred to the Orofacial Pain Control Center - CCDO of the Dental School of the University of Pernambuco - FOP, in the period from January 2006 to August 2007 in relation to the demographic variables. Methodology: This is a descriptive study that used data from the CCDO database. The sample comprised

Paulo Henrique; Wanderley Guimarães; Arnaldo de França; Caldas Júnior; Maurício Kosminsky; João Marcílio; Coelho Netto; Lins Aroucha


Cselt Rapporto Annuale 1990: Relazioni E Bilancio al 31 Dicembre 1990 (Activities Report of the Centro Studi E Laboratori Telecomunicazioni: Reports and Balances (Annual Report for December 31, 1990)).  

National Technical Information Service (NTIS)

The CSELT management report on structure and activities covers public and ISDN (Integrated Services Digital Network) networks, intelligence and service networks, mobile services, management of OSS (Operation Support Systems) and networks, high-speed netwo...



67 FR 68165 - Imperial Irrigation District Water Conservation and Transfer Project, California  

Federal Register 2010, 2011, 2012, 2013

...Brawley Public Library, 400 Main Street, Brawley, CA 92227 [sbull] Carlsbad City Library, 1775 Dove Lane, Carlsbad, CA 92009 [sbull] El Centro Public Library, 539 State Street, El Centro, CA 92243 [sbull] Los Angeles Central Library,...



78 FR 5562 - Additional Designations, Foreign Narcotics Kingpin Designation Act  

Federal Register 2010, 2011, 2012, 2013

...JATZIRY S.A. DE C.V., Callejon Tercero SN, Col. Centro, Guasave, Sinaloa, Mexico...TERRESTRES S.A. DE C.V., Callejon Tercero SN, Col. Centro, Guasave, Sinaloa, Mexico...GUASAVE S.A. DE C.V., Callejon Tercero SN, Col. Centro, Guasave, Sinaloa,...



Después de Kahneman y Tversky; ¿Qué queda de la Teoría Económica?  

Microsoft Academic Search

En Una mente brillante el decano de la facultad le dice a John Forbes Nash: “¿se da usted cuenta que esto contradice 150 años de teoría económica?”. Además, desde que en 2002 el premio Nobel en economía le fue otorgado al psicólogo cognitivista Daniel Kahneman, más de un periodista sugiere que “lo poco que quedaba del análisis económico” tiene que

Juan Carlos De Pablo



Internal parasites of free-ranging guanacos from Patagonia  

Microsoft Academic Search

In the winter of 2000, a greater than 80% reduction in the guanaco population located in Cabo Dos Bah??as Wildlife Reserve, Chubut, Argentina, was evident due to massive mortality attributed to starvation. Twelve guanacos were necropsied and samples were analyzed at the Parasitology Laboratory of Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral. Fecal analysis revealed developmental stages of Nematodirus

P. M. Beldomenico; M. Uhart; M. F. Bono; C. Marull; R. Baldi; J. L. Peralta



Normal form reduction for time-periodically driven differential equations  

NASA Astrophysics Data System (ADS)

We present a global characterisation for the normal form of a time-periodically driven differential equation describing the behaviour of a physical system in the neighborrhood of a multiple instability. On leave from Universidad de Chile, Facultad de Ciencias Fisicas y Matematicas, Dept. de Fisica, Santiago, Chile.

Elphick, C.; Iooss, G.; Tirapegui, E.



Entropy functionals associated to shifts dynamical systems  

NASA Astrophysics Data System (ADS)

We construct entropy functionals which discriminate the measures which converge to equilibrium in the case of shifts dynamical systems. In particular for K-shifts it is proved that some functionals associated to them decrease monotonically to zero. On leave of absence from Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile.

Martinez, S.; Tirapegui, E.




Microsoft Academic Search

El objetivo de este análisis es diagnosticar el nivel de conocimientos matemáticos teórico-prácticos con el que los alumnos llegan al primer curso en la Facultad de Ciencias Económicas y Empresariales, así como establecer el perfil más adecuado de acceso. Para ello se ha pasado a una muestra de 109 alumnos un test con 40 preguntas o ítems que son cuestiones

Álvarez Martínez; Guerrero Manzano


Preference Indices for Forage Species Grazed by Spanish Goats on a Semiarid Shrubland in México  

Microsoft Academic Search

Ramirez, R. G., Sauceda, J. G., Narro, J. A. and Aranda, J. 1993. Preference indices for forage species grazed by Spanish goats on a semiarid shrubland in Mexico. J. Appl. Anim. Res., 3: 55–66.Botanical composition of diets of Spanish goats was studied on the Facultad de Agronomia, V. A N. L. Experimental Station with the objectives to determine monthly differences

R. G. Ramírez; J. G. Sauceda; J. A. Narro; J. Aranda



Seroprevalencia de anticuerpos contra el virus de hepatitis C (VHC) en trabajadoras sexuales que acuden a un Centro de Referencia de Infecciones de Transmisión Sexual (CERITSS) de la ciudad de Iquitos, Perú Seroprevalence of antibodies against hepatitis C virus in Female sex workers patients from the sexually transmitted Infections Reference Center in Iquitos, Peru  

Microsoft Academic Search

Introducction: the principal described risk factors to contract the hepatitis C virus (HCV) are blood transfusion antecedents and intravenous drug use; sexual transmission risk is controversial. In Peru there exist few studies whose female sex worker (FSW) HCV prevalence oscillates between 0-1%. The present study is based in Iquitos, a Peruvian jungle city with high sexual commerce and HIV\\/AIDS prevalence.



Implementacion de la tecnica de difraccion de neutrones en el Centro Nuclear del Instituto Nacional de Investigaciones Nucleares para el estudio de materiales. (Implementation of neutron diffraction technique at Nuclear Center of National Institute of Nuclear Research for study of materials).  

National Technical Information Service (NTIS)

The Neutron Diffraction technique is a helpful tool for the study of materials. The purpose was to verify that such technique works with the Neutron Diffractometer of National Institute of Nuclear Research. The scope, is to study crystalline materials by ...

L. R. Macias Betanzos



NURE Aerial gamma-Ray and Magnetic Reconnaissance Survey, Colorado-Arizona Area: Salton Sea NI II-9, Phoenix NI 12-7, El Centro NI II-12, AJO NI 12-10, Lukeville NH 12-1 Quadrangles. Volume I. Narrative Report.  

National Technical Information Service (NTIS)

A rotary-wing reconnaissance high sensitivity radiometric and magnetic survey, encompassing several 1:250,000 quadrangles in southwestern Arizona and southeastern California, was performed. The surveyed area consisted of approximately 9300 line miles. The...




Microsoft Academic Search

Usualmente, los cursos de matemáticas que apoyan la formación de profesionistas en diver- sas áreas de conocimiento se enfocan principalmente en la resolución de problemas propios de esa área; sin embargo, esta disciplina permite lograr un propósito más amplio y profundo que sólo convertirse en un apoyo instrumental para el planteamiento y solución de proble- mas, este es: el desarrollo

Laura P. Peñalva Rosales; Marisa Ysunza Breña; Margarita FernándezRuvalcaba


La cohabitation : un million de couples non mariés  

Microsoft Academic Search

[spa] La convivencia : un million de parejas sin contraer matrimonio - En 1968, se hacia el recuento de 67 000 parejas sin casar en las que el varon no llegaba a los 35 años. Hoy dia se elevan aproximadamente a 600 000. Estas cifras dan la medida de la extension del matrimonio consensual entre la juventud. Al propio tiempo

Pierre-Alain Audirac



Percepción del grado de conflicto en familias adoptivas y no adoptivas  

Microsoft Academic Search

Este trabajo analiza el grado de conflicto entre padres e hijos\\/as teniendo en cuenta tanto la percepción de los propios padres como la de los adolescentes adoptados y no adoptados. 55 adolescentes adopta- dos y sus padres; y 402 adolescentes no adoptados y sus padres (n= 258) contestaron al Cuestionario de Conflictos de Motrico, Fuentes y Bersabé (2001). Los resultados

Isabel María; Bernedo Muñoz; María Jesús; Fuentes Rebollo; Milagros Fernández Molina


On collective memory and social forgetting  

Microsoft Academic Search

El presente trabajo argumenta que tanto memoria como olvido, lejos del individualismo que ha caracterizado su concepción durante el siglo XX, se inscriben en la arena social y que son polos opuestos de un mismo proceso; esto es, que son producciones colectivas, es decir, sociales. Asimismo, la memoria colectiva cuenta con sus propios recursos como los marcos sociales, y los

Jorge Mendoza García



Efectos colaterales de un reparto insostenible de recursos  

Microsoft Academic Search

El ser humano, como cualquier otro organismo, posee la capacidad de modificar su entorno para su propio beneficio, especialmente de cara a asegurar su manutención y la de aquellos a su cargo. Con el desarrollo tecnológico esa capacidad ha adquirido dimensiones sin precedentes para el entorno que nos sustenta, con consecuencias difíciles de estimar y menos aun de predecir, que

Marta I. Saloña Bordas



Los indicadores de insustentabilidad urbana como indicadores de conflicto social  

Microsoft Academic Search

Las ciudades son ecológicamente insostenibles. Sus «huellas ecológicas» son muchos mayores que sus propios límites administrativos. Las ciudades procesan unas grandes cantidades de materiales y energía y excretan residuos de distintos tipos. Sin embargo, este artículo se pregunta de manera optimista si acaso no son las ciudades los lugares donde se producen las innovaciones tecnológicas ecoeficientes. Se pregunta también si

Joan Martínez Alier




Microsoft Academic Search

Un elemento básico será el que distinga las arquitecturas griega y romana: su espíritu constructivo. Si en Grecia las construcciones estaban pensadas para embellecer, en Roma eran ideadas para servir. Por lo tanto lo que primaba no era únicamente el engrandecimiento del espíritu, sino también enaltecer al propio imperio. Este afán utilitario le hará emplear materiales nuevos, como son el

Joaquín Pérez García-Valdecasas



Determinantes del Tamaño de un Comité de Política Monetaria: Teoría y Evidencia de Corte Transversal  

Microsoft Academic Search

Estudios teóricos y empíricos desde la perspectiva de diferentes ciencias sugieren que un grupo de trabajo óptimo debería tener entre 5 y 9 miembros, aunque este número puede variar bajo diversas circunstancias y está bajo la influencia de factores propios al entorno en el que el grupo se desarrolla. Este trabajo presenta un modelo que analiza el tamaño de los

Szilard Erhart; Jose L. Vasquez



Effect of Cadmium on Cellular Viability in Two Species of Microalgae ( Scenedesmus sp. and Dunaliella viridis )  

Microsoft Academic Search

We determined the effect of several concentrations of cadmium (0, 5, 10, and 20 ?g\\/l) on cellular viability in the microalgae\\u000a Scenedesmus sp. and Dunaliella viridis, by measuring growth at 0, 24, 48, 72, and 96 h and pigment production at 10 days. Algae were obtained from the Nonvascular\\u000a Plant Laboratory collection, in the Facultad Experimental de Ciencias, Universidad del Zulia, Venezuela. Growth

Letty Beatriz C. Marcano; Ingrid M. Carruyo; Xiomara M. Montiel; Carolina B. Morales; Patricia Moreno de Soto



Casimir energies and special dimensions in a toy model for branes  

NASA Astrophysics Data System (ADS)

We consider a generalization to branes of the old action for the strings without reparamentrization invariance. These actions admit natural supplementary mass-shell conditions. By regularizing the Casimir energies we calculate the special dimensions at which these toy branes show vector massless states in its spectrum. They all turn out to be non-integers. On sabbatical leave from Departamento de Física, Facultad de Ciencias, Universidad Central de Venezuela, Apartado Postal 66961, Caracas 1061A, Venezuela.

Cohen, Isaac



El tránsito suave de la teoría económica a través de las relaciones Norte-sur en el área de población y desarrollo durante la Guerra Fría: el caso del  

Microsoft Academic Search

El artículo pretende evidenciar cómo el conocimiento económico producido en materia de población y desarrollo obedece al tránsito suave de la teoría económica que se desarrolla por medio de relaciones científicas entre el centro y la periferia, tomando el caso del Programa de Demografía del Centro de Estudios sobre Desarrollo Económico (CEDE) de la Universidad de los Andes. Estas relaciones

María Margarita Fajardo Hernández



Artificial Second Order Non-Linearity in Photonic Crystals.  

National Technical Information Service (NTIS)

We describe a technique for obtaining effective second order non- linearity X(sup 2) in non-centro-symmetric Photonic Crystal made from centro- symmetric materials (e.g., glass, Ge or Si). The effect is based on the electric quadrupole transition, strong ...

A. Feigel B. Sfez Z. Kotler



Uso seguro de los medicamentos después de un desastre ...  

Center for Drug Evaluation (CDER)

... El Centro para la Evaluación e Investigación de Medicamentos (CDER, por su sigla en inglés) y la FDA ofrecen la siguiente información sobre el ... More results from


La FDA investiga Brote de Hepatitis A en varios estados ...  

Center for Food Safety and Applied Nutrition (CFSAN)

... FDA, los Centros para el Control y la Prevención de Enfermedades (CDC) y de las autoridades de salud locales y estatales acerca de un brote de ... More results from


78 FR 47828 - Additional Designations, Foreign Narcotics Kingpin Designation Act  

Federal Register 2010, 2011, 2012, 2013 are blocked pursuant to section 805(b) of the Kingpin Act. Individuals: 1. NUNEZ BEDOYA, Jose Antonio, Calle Lic. Benito Juarez No. 396, Interior No. 5, Colonia Centro, Culiacan, Sinaloa 80000, Mexico; DOB 21 Dec 1941; POB Sinaloa,...



Ressonancia de quadrupolo nuclear da arsenolita. (Nuclear quadrupole resonance of arsenolite).  

National Technical Information Service (NTIS)

A pulsed Nuclear Quadrupole Resonance (NQR) spectrometer was constructed using imported Matec units. Peripherical components were specially assembled and tested for the implantation of the spin-echo technique in the Laboratorio de Centros de Cor of IFUSP....

R. Madarazo



77 FR 51616 - Additional Designations, Foreign Narcotics Kingpin Designation Act  

Federal Register 2010, 2011, 2012, 2013

...Gabriela; a.k.a. SAENZ PINAL, Maria Corina); DOB 19 May 1965; POB...7-12 Zona 14, Centro Empresarial La Villa Bodega 23, Guatemala City, Guatemala...Zona 2, Residenciales Valles De Maria, Villa Nueva, Guatemala;...



Guía de Etiquetado de Suplementos Dietéticos  

Center for Food Safety and Applied Nutrition (CFSAN)

... Por preguntas sobre este documento, póngase en contacto con Susan Thompson en el Centro para la Seguridad Alimentaria y Nutrición Aplicada ... More results from


Orientación preliminar para la industria: Preguntas y ...  

Center for Food Safety and Applied Nutrition (CFSAN)

Text Version... de: Oficina de Seguridad de los Alimentos, Comunicación y Respuesta ante una Emergencia, HFS-005 Centro para la Seguridad Alimentaria y la ... More results from


Alguns efeitos das radiacoes gama do Cobalto-60 em Chrysomya megacephala (Fabricius, 1794) (Diptera-Calliphoridae). (Some gamma radiation ((60)Co) effects on Chrysomya megacephala (Fabricius, 1794) (Diptira-Calliphoridae)).  

National Technical Information Service (NTIS)

The effect of different gama radiation ((sup 60)Co) doses on Chrysomya megcephala (Fabricius) have been studied under laboratory conditions, in the Entomology Section of Centro de Energia Nuclear na Agricultura (CENA-USP), Piracicaba, SP, Brasil. The inse...

C. R. Garcia



Geothermal District Heating Systems.  

National Technical Information Service (NTIS)

Ten district heating demonstration projects and their present status are described. The projects are Klamath County YMCA, Susanville District Heating, Klamath Falls District Heating, Reno Salem Plaza Condominium, El Centro Community Center Heating/Cooling...

G. S. Budney F. Childs



59 FR- Federal Property Suitable as Facilities To Assist the Homeless  

Federal Register 2010, 2011, 2012, 2013

...School Monterey Co: Monterey CA 93943- Landholding Agency...School Monterey Co: Monterey CA 93943- Landholding Agency...Land (by State) California Salton Sea Test Range ElCentro Co: Imperial CA 93555- Landholding...



Cell Therapy: Filling the Gap Between Basic Science and Clinical Trials. First International Workshop held in Rome, Italy on October 15-17, 2001.  

National Technical Information Service (NTIS)

The Istituto Superiore di Sanita, in collaboration with the Istituto Dermatopatico dell'Immacolata (Rome), the Istituto Nazionale Ricerca sul Cancro-Centro Biotecnologie Avanzate (Genoa) and the University G. D'Annunzio (Chieti), has organized this intern...

A. R. Migliaccio C. Carta S. Campisi



Curriculum Vitae: Luis Ostrosky  

Center for Biologics Evaluation and Research (CBER)

Text Version... 4. Ostrosky-Zeichner L, Baez R, Rangel S, Ponce de Leon S. Epidemiologia de los brotes nosocomiales: Experiencia de catorce anos en un centro ... More results from


Aktuelle Entwicklungen des Wettbewerbs der Gesellschaftsrechte  

Microsoft Academic Search

Die drei causes célèbres des EuGH zur Niederlassungsfreiheit der Gesellschaften, Centros, Überseering und Inspire Art , haben eine Flut von Anmerkungen, Besprechungsaufsätzen und Monographien hervorgebracht, die den Beginn des Wettbewerbs der Gesellschaftsrechtsordnungen\\

Eva-Maria Kieninger



EPA Science Inventory

In collaboration with the Panamanian non-governmental organization Centro de Estudios y Acción Social Panameño (CEASPA), the Northwestern University chapter of Engineers for a Sustainable World (ESW-NU) has been working with the rural ranching community of San...


No mundo de hoje é importante estar ALERTA para proteger ...  

Center for Food Safety and Applied Nutrition (CFSAN)

Text Version... and Prevention (Centros para Controlo e Prevenção de Doenças dos EUA) US Department of Agriculture (Departamento de Agricultura dos EUA) More results from


76 FR 50455 - Foreign-Trade Zone 163-Ponce, Puerto Rico Application for Expansion  

Federal Register 2010, 2011, 2012, 2013

...Peerless Oil & Chemicals, Inc., petroleum terminal facilities in Pe[ntilde]uelas and Guaynilla; Site 3 (3 acres)--Hato Rey Distribution Center, located at Angel Buonoma Street 361 and 71, San Juan; Site 4 (14 acres)--Centro...



Legume Green Manures: Principles for Management Based on Recent Research.  

National Technical Information Service (NTIS)

The report summarizes aspects of several experiments at the Centro de Pesquisa Agropecuaria do Cerrado (CPAC) at Planaltina, Brazil, where green manure legumes were evaluated as sources of nitrogen for succeeding nonlegume crops. The research focused on t...

D. J. Lathwell



Regulación de la Sangre y los Componentes Sanguíneos en ...  

Center for Biologics Evaluation and Research (CBER)

Text Version... America's Blood Centers, compuesta de centros sanguíneos individuales con licencia, recolecta un 45 por ciento adicional del suministro nacional ... More results from



Microsoft Academic Search

Resumo - Este trabalho é pioneiro para a região Centro-Oeste do Brasil e visa ao aprofundamento da problemática do aproveitamento do Rio Araguaia como via navegável para transportar as safras de grãos das regiões Centro-Norte. O Programa de Desenvolvimento da Hidrovia Tocantins- Araguaia é uma iniciativa do Ministério dos Transportes para estabelecer a navegação fluvial confiável e segura em 2.242

Rone Antônio de Azevedo


Embedded multilayer thin film stacks as polarizing beam splitters and wave retarders operating under condition of frustrated total internal reflection  

Microsoft Academic Search

The polarization properties of embedded centro-symmetric and periodic multilayer stacks under conditions of frustrated total internal reflection (FTIR) are considered. The centro-symmetric multilayer stack consists of a high-index center layer sandwiched between two identical low-index films and high-index - low-index bilayers repeated on both sides of the central trilayer maintaining the symmetry of the entire stack. The periodic multilayer consists

Siva Reddy Perla



Embedded Multilayer Thin Film Stacks as Polarizing Beam Splitters and Wave Retarders Operating under Condition of Frustrated Total Internal Reflection  

Microsoft Academic Search

The polarization properties of embedded centro-symmetric and periodic multilayer stacks under conditions of frustrated total internal reflection (FTIR) are considered. The centro-symmetric multilayer stack consists of a high-index center layer sandwiched between two identical low-index films and high-index – low-index bilayers repeated on both sides of the central trilayer maintaining the symmetry of the entire stack. The periodic multilayer consists

Perla Siva Reddy



"Biomoléculas": cellular metabolism didactic software  

NASA Astrophysics Data System (ADS)

"Biomoléculas" is a software that deals with topics such as the digestion, cellular metabolism and excretion of nutrients. It is a pleasant, simple and didactic guide, made by and for students. In this program, each biomolecule (carbohydrates, lipids and proteins) is accompanied until its degradation and assimilation by crossing and interrelating the different metabolic channels to finally show the destination of the different metabolites formed and the way in which these are excreted. It is used at present as a teaching-learning process tool by the chair of Physiology and Biophysics at the Facultad de Ingeniería - Universidad Nacional de Entre Ríos.

Menghi, M. L.; Novella, L. P.; Siebenlist, M. R.



Percepcion de los profesores universitarios acerca del concepto cultura cientifica y de sus implicaciones en el nuevo bachillerato del Recinto de Rio Piedras de la Universidad de Puerto Rico  

NASA Astrophysics Data System (ADS)

El Senado Academico del Recinto de Rio Piedras de la Universidad de Puerto Rico aprobo en el ano academico 2005-2006 la Certificacion 46, que contiene los lineamientos de un nuevo bachillerato. Este nuevo bachillerato introdujo cambios significativos en el curriculo tradicional. Entre ellos se encuentra la reduccion del componente de educacion general y el de Ciencias Biologicas en particular. La reduccion de creditos en el componente de Ciencias Biologicas ha obligado a reevaluar el concepto de cultura cientifica que desarrollan esos cursos. El proposito del estudio consistio en auscultar las percepciones de los profesores de las Facultades de Administracion de Empresas, Humanidades, Ciencias Sociales, Ciencias Naturales, Educacion y Estudios Generales del Recinto de Rio Piedras de la Universidad de Puerto Rico en torno al concepto de cultura cientifica, los contenidos disciplinares del curso de Ciencias Biologicas y la reduccion de creditos en el nuevo bachillerato. Las preguntas que guiaron la investigacion fueron: ¿cuales son las percepciones que tienen los profesores de las Facultades de Administracion de Empresas, Ciencias Sociales, Estudios Generales, Ciencias Naturales, Humanidades y Educacion, en torno al concepto de cultura cientifica y los contenidos disciplinares del curso de Ciencias Biologicas? ¿cuales son las percepciones que tienen los profesores de Ciencias Biologicas en torno al concepto cultura cientifica y los contenidos disciplinares del curso de Ciencias Biologicas? ¿existen diferencias significativas por facultad, genero, experiencia, rango y nombramiento en las percepciones que tienen los profesores del Recinto de Rio Piedras de la Universidad de Puerto Rico sobre los elementos que caracterizan la cultura cientifica y los contenidos biologicos que deben tener los egresados del Recinto? ¿que implicaciones curriculares tienen estos testimonios en el desarrollo del concepto de cultura cientifica en el nuevo bachillerato? Para realizar la investigacion se utilizo una metodologia cuantitativa y la herramienta para lograrlo fue una encuesta. La encuesta se analizo estadisticamente mediante analisis de frecuencias y por cientos, prueba ANOVA, prueba t, pruebas Post Hoc de Tukey y de Levene. Tambien se realizo nuevamente una prueba de confiabilidad mediante el alfa de Cronbach. Los resultados reflejaron que los profesores de las Facultades de Administracion de Empresas, Ciencias Sociales, Ciencias Naturales, Educacion, Humanidades, Estudios Generales y el Departamento de Ciencias Biologicas tienen una percepcion muy positiva del concepto de cultura cientifica, los contenidos curriculares de Ciencias Biologicas y del nuevo bachillerato.

Ramos Pastrana, Nilsa


Research Based Proposal To Learn Optics Better  

NASA Astrophysics Data System (ADS)

During many years of teaching Physics at the Facultad de Ingeniería-Universidad de Buenos Aires (FIUBA) and at the Teachers School IES N°1, we have found that students usually have problems in understanding various items of Optics. In this work, we present the difficulties that appear during the teaching and learning processes and some of its causes. We propose a teaching method to make processes easier, to enable a better understanding and a long lasting retention of these topics in the cognitive structure of our students.

Menikheim, María C.; Skop, Guillermo; Castellano, Antonio; Perez, Liliana I.



rac-1-(5-Bromo-2-hy-droxy-phen-yl)-1-oxopropan-2-yl morpholine-4-carbo-dithio-ate  

PubMed Central

In the racemic title compound, C14H16BrNO3S2, synthesized from the corresponding ?-bromo­propio­phenone, the dihedral angle between the plane of the phenol group and that of the planar section [maximum deviation = 0.040?(2)?Å] of the morpholine-4-carbodi­thiol­ate moiety is 76.36?(10)°. A strong intra­molecular phenol O—H?O hydrogen bond if present in the mol­ecule. In the crystal, only weak C—H?S and C—H?O inter­actions are found.

Sarbu, Laura G.; Hrib, Cristian G.; Birsa, Lucian M.



The Unification of Astrometric Catalogues  

NASA Astrophysics Data System (ADS)

RESUMEN Se desarrolla un metodo de interpolaci6n para detectar diferencias sistematicas entre catalogos de posiciones y movimientos propios y se aplica a los catalogos AGK3 y Santiago 67, usando los cata'logos No. 1 y No. 2 del Cfrculo Meridiano Carlsberg como sistema de referencia. ABSTRACT An interpolation mechanism is developed for the detection of systematic differences between position and proper motion catalogues and is applied to the AGK3 and Santiago 67 catalogues, using the Carlsberg Meridian Circle catalogues No. 1 and No. 2 as reference sources. Key words: ASTROMETRY

Stock, J.; Abad, C.



The Gran Telescopio Canarias and Calar Alto Virtual Observatory compliant archives  

NASA Astrophysics Data System (ADS)

The Gran Telescopio Canarias (GTC) and Calar Alto archives are the result of the collaboration agreements between the Centro de Astrobiología (CAB, INTA-CSIC)) and two entities: GRANTECAN S.A. and the Centro Astronómico Hispano Alemán (CAHA). The archives have been developed in the framework of the Spanish Virtual Observatory and are maintained by the Data Archive Unit at CAB. The archives contain both raw and science ready data and have been designed in compliance with the standards defined by the International Virtual Observatory Alliance (IVOA) which guarantees a high level of data accessibility and handling. In this paper we describe the main characteristics and functionalities of both archives.

Solano, Enrique; Gutiérrez, Raúl; Alacid, José Manuel; Jiménez-Esteban, Francisco; Velasco Trasmonte, Almudena



International comparison of resistance thermometers between NMIs from Spain, Mexico and Andean countries  

NASA Astrophysics Data System (ADS)

An international comparison on semi-standard Platinum Resistance Thermometers (PRTs) among the National Metrology Institutes (NMIs) of Spain, Mexico and the Andean Countries (Bolivia, Colombia, Ecuador, Peru and Venezuela) began in 2004 and was successfully completed in 2005. Two PRTs were circulated (hand carried) and compared from -40 °C up to 250 °C. The Centro Espan~ol de Metrología (Spanish NMI), CEM, was the pilot laboratory and the Centro Nacional de Metrología (Mexican NMI), CENAM, was the co-pilot laboratory. This paper shows the details of the comparison and the final results as they were presented in the approved final report of the comparison in September of 2005.

del Campo, D.; Ruiz, V. C.; Méndez-Lango, E.; Córdova, L.; von Borries, E.; Sánchez, C. A.; Arévalo, A.; Aguilera, B.; Guillén, E.; Cabrera, C.; Quintana, L.



New algorithms for phase unwrapping: implementation and testing  

NASA Astrophysics Data System (ADS)

In this paper it is shown how the regularization theory was used for the new noise immune algorithm for phase unwrapping. The algorithm were developed by M. Servin, J.L. Marroquin and F.J. Cuevas in Centro de Investigaciones en Optica A.C. and Centro de Investigacion en Matematicas A.C. in Mexico. The theory was presented. The objective of the work was to implement the algorithm into the software able to perform the off-line unwrapping on the fringe pattern. The algorithms are present as well as the result and also the software developed for the implementation.

Kotlicki, Krzysztof



Evaluation of genotoxic activity of maleic hydrazide, ethyl methane sulfonate, and N-nitroso diethylamine in Tradescantia  

Microsoft Academic Search

Objective. To assess the genotoxic activity of N-nitroso diethylamine (NDEA), maleic hydrazide (MH), and ethyl methane sulfonate (EMS) using two systems: the comet as- say on nuclei from Tradescantia, and the pink mutation test on Tradescantia staminal hairs (clone 4430). Material and Methods. Tradescantia cups was obtained from Laborato- rio de Citogenética y Mutagénesis del Centro de Ciencias de la

Carlos Alvarez-Moya; Anne Santerre-Lucas; Guillermo Zúñiga-González; Olivia Torres-Bugarín; Eduardo Padilla-Camberos; Alfredo Feria-Velasco



The Project and the Documentaries: Two Distinct and Complementary Dimensions of the \\  

Microsoft Academic Search

the Centro de Trabalho Indigenista (Center for Work with Indigenous Peoples), a non- governmental organization which for the past twenty years has suppor ted Brazilian indigenous communities with such initiatives as the demarcation of indigenous land, as well as economic and educational programs. The main objective of the video project has been to make video accessible to indigenous people as

Vincent Carelli


Expectativas de adolescentes em relação a mudanças do perfil nutricional Expectations of adolescents in relation to the changes of nutritional profile  

Microsoft Academic Search

This article presents results of a research of nature quanti-qualitative on nutrition and ad- olescents of Centro Salesiano do Menor, located in Vitória (ES). The aim of this study was to know the nutritional profile and expectations of the ad- olescents in relation the changes in the nutritional profile. Structured interview with subjective and objective questions was realized with 43

Patrícia Déa Braga; Maria del Carmen; Bisi Molina; Nágela Valadão Cade



Microsoft Academic Search

RESUMEN: La aglomeración urbana del centro de Asturias, que se encuentra entre las principales de España y a la que denominamos Ciudad Astur, constituye un fenómeno territorial de gran trascendencia, en fase de consolidación y de transformación de simple aglomeración en ciudad. Su consideración como factor clave para el desarrollo regional y para la articulación del territorio regional requiere su

Fermín Rodríguez Gutiérrez; Rafael Menéndez Fernández


Crystal Structure of alpha -Fe sub 2 (CrO sub 4 ) sub 3 .3H sub 2 O.  

National Technical Information Service (NTIS)

alpha Fe sub 2 (CrO sub 4 ) sub 3 .3H sub 2 O has been studied by single-crystal x-ray structural analysis. It crystallizes in the centro symmetric, monoclinic space group P2 sub 1 /c, with alpha = 15.802 (7), b = 5.436 (4), c = 14.603 (7) A, beta 108.13(...

A. Riou A. Bonnin



Entre metrópolis y periferias. Análisis de los movimientos migratorios a partir del censo de población de 1993  

Microsoft Academic Search

El Área de Demografía y Estudios de Población, del Centro de Investigaciones sobre Dinámica Social –CIDS– de la Universidad Externado de Colombia, definió como objetivo de una de sus Líneas estratégicas de investigación el análisis de los procesos migratorios en Colombia. Aunque la migración constituye un elemento central en la determinación del crecimiento, volumen y composición de la población, este

Alejandro González Pulido; Norma Rubiano


Músico, Exilio y Memoria — La Lucha Por Los Restos De Manuel De Falla  

Microsoft Academic Search

En vísperas de la guerra civil, España era uno de los centros intelectuales más efervescentes de Europa. A partir de 1898, tras perder los últimos restos del Imperio en el Nuevo Mundo (Cuba y Puerto Rico), y particularmente en los años de la Segunda República (1931–1936), se llevaron a cabo apasionantes debates sobre cuestiones de identidad nacional y el sendero

Raanan Rein



The neotropical genus Dendrocephalus (Crustacea: Anostraca: Thamnocephalidae) in Brazil (South America), with a description of two new species  

Microsoft Academic Search

Two new species in the neotropical genus Dendrocephalus (Anostraca, Thamnocephalidae) are described from Brazil. Dendrocephalus orientalis n. sp., occurs in temporary rainpools in the eastern part of Brazil in the States of Paraíba and Bahia (Nordeste region). Dendrocephalus goiasensis n. sp. inhabits a temporary rainpool in the ‘cerrados’ in the State of Goias (Centro-Oeste region). The descriptions are based principally

N. Rabet; A. Thiéry



VIABILIDADE TÉCNICA E ECONÔMICA DA APLICAÇÃO DE ÁGUA NA CULTURA DO FEIJOEIRO COMUM ( Phaseolus vulgaris L.) Technical and economic viability of the application of water on the culture of common bean (Phaseolus vulgaris L.)  

Microsoft Academic Search

This experiment was carried out at campus II of Patos de Minas University Center (Centro Universitário de Patos de Minas (UNIPAM) in Patos de Minas, MG, during the year of 2005, with the purpose of evaluating the yield of the common bean plant, cultivar Talismã, submitted to different levels of irrigation water replacement, as well as determining the optimum economic

Márcio José de Santana; Jacinto de Assunção Carvalho; Messias José; Bastos de Andrade; Gilson Gerson Gervásio; José Carlos Braga; Eduardo Branquinho Lepri



Microsoft Academic Search

Indudablemente Darcy Ribeiro se ha transformado en uno de los antropólogos latinoamericanos más influyentes de las últimas décadas. Centrado en el estudio de las causas económicas y políticas del desarrollo. En este contexto, la presente reseña examina su trabajo: Las Américas y la Civilización, obra publicada originalmente en 1972 por el Centro Editor de América Latina. El capítulo introductorio comienza

Maximiliano E. Korstanje



Maize Genetic Resources  

Technology Transfer Automated Retrieval System (TEKTRAN)

This chapter describes the resources held at the Maize Genetics Cooperation • Stock Center in detail and also provides some information about the North Central Regional Plant Introduction Station (NCRPIS) in Ames, IA, Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT) in Mexico, and the N...


Education and Imperialism: The Puerto Rican Experience in Higher Education, 1898-1986. Working Paper Series.  

ERIC Educational Resources Information Center

|An integrated historical account of the Puerto Rican experience in higher education is presented by the Higher Education Task Force of the Centro de Estudios Puertorriquenos of Hunter College, City University of New York. The present situation of Puerto Ricans in higher education on the Island and in the United States reflects the plight Puerto…

Rodriguez-Fraticelli, Carlos


800,000 gal/d reverse-osmosis system treats seawater for boiler-feed makeup  

SciTech Connect

The Planta Centro Station for CADAFE is intended to demonstrate that seawater reverse osmosis is a viable water-treatment process for the power industry. Reverse osmosis offers to the industry a flexible modular design, easy to operate and economically favorable. It has established itself as a prime competitor to the more-conventional evaporator process. 4 refs.

Pang, A.W.; Kinstler, W.I.



Noetning av Belaeggningssten i Kulkvarn (Abrasion in Laboratory Ball Mill).  

National Technical Information Service (NTIS)

Tests have been made in a laboratory ball mill, manufactured by Centro-Morgardshammar, Sweden, in order to investigate an alternative test method to the Swedish Abrasion Value (a modified B.S. 812 Abrasion Test). Wet abrasion has been carried out in the b...

P. Hoebeda J. Chytla



Desarrollo y utilización de habilidades: el caso de los migrantes en León, Guanajuato, procedentes de la Ciudad de México  

Microsoft Academic Search

En este artículo se presenta una investigación sobre el desarrollo y el uso de habilidades de los migrantes provenientes de la Ciudad de México que radican en León, Guanajua- to. Los datos del Censo General de Población y Vivienda 2000 relativos a los habitantes de León revelan que los migrantes provenientes de los grandes centros urbanos tienen, en promedio, mayores

Ricardo Sabatés Aysa



Microsoft Academic Search

El propósito del siguiente artículo es realizar un abordaje antropológico al dramático hecho provocado en la Columbine High School (EE.UU) en abril de 1999. Nuestra mirada se enfoca en el análisis comparativo de las películas Bowling for Columbine de Michael Moore (2002) y Elephant de Gus Van Sant (2003), quienes frente a la problemática de la violencia generada en centros

Osvaldo Horacio Sironi



Study of Seismic Clusters at Bahía de Banderas Region, Mexico  

Microsoft Academic Search

Given that the coast in the states of Jalisco and south of the state of Nayarit is located within a region of high seismic potential and also because population is increasing, perhaps motivated by the development of tourism, the Civil Defense authorities of Jalisco and the Centro de Sismología y Volcanología de Occidente-SisVOc of Universidad de Guadalajara started in the

F. J. Nunez-Cornu; M. Rutz-Lopez; C. Suarez-Plascencia; E. Trejo-Gomez



Bridging the Technology Gap for Low-Income Spanish-Speaking Immigrant Families  

ERIC Educational Resources Information Center

|Research shows that families have a powerful effect on children's success in school. Parental involvement at home and in school is positively associated with children's school readiness and significant school performance. This study is focused on examining the impact of an intervention technology program--Community Learning Centers--(Centros

Rivera, Hector




Microsoft Academic Search

SUMMARY The influence of irrigation on the behavior of thre e hybrids (INIAP, IRHO and ASD) was studied in the Centro de Investigaciones en Pal ma (CIPAL) belongin to the Asociación Nacional de Cultivadores de Palma Aceitera (ANCUPA). The following variables were evaluated: estipete base diameter, p lant height, foliar crown diameter, foliar emission, sex ratio, foliar area and yield.

Víctor Hugo


Beyond the Borders: A Partnership between U.S. and Mexican Schools for Students Who Are Visually Impaired. Practice Report  

ERIC Educational Resources Information Center

|Since 2002, the New Mexico School for the Blind and Visually Impaired (NMSBVI) in Alamogordo, New Mexico, has worked to create a partnership with the "Centro de Capacitacion para Invidentes" in Durango, Mexico, and the "Instituto de Asesoria y Apoyo para Ciegor" in Ciudad Juarez, Mexico. The purpose of this association was to provide the…

Wood, Jackie; Poel, Elissa Wolfe



Journal of Environmental Radioactivity special issue: international topical conference on Po and radioactive Pb isotopes.  


An international conference on polonium (Po) and radioactive isotopes was held in Seville Spain, 26-28 October 2009 at the Centro Nacional de Aceleradores. It was attended by 138 participants from 38 different countries. The sessions covered all aspects on Po and lead (Pb) such as radiochemistry, terrestrial and marine radioecology, kinetics, sedimentation rates, atmospheric tracers, NORM industries and dose assessment. PMID:20889244

Holm, Elis; Garcia-Tenorio, Rafael



Efeito do estresse térmico e do exercício sobre parâmetros fisiológicos de cavalos do exército brasileiro  

Microsoft Academic Search

RESUMO - Os cavalos do exército brasileiro são usados em dias de exposição e, muitas vezes, submetidos a exercício intenso, que, aliado às condições climáticas do cerrado do Centro-Oeste brasileiro, resulta na necessidade de extrema aclimatação dos mesmos. O objetivo desse estudo foi determinar o efeito do estresse térmico e do exercício a que estão submetidas às raças de eqüinos

Giane Regina Paludo; Concepta McManus; Renata Queiroz de Melo; André Granja Cardoso; Fabíola Peixoto da Silva Mello; Moryenne Moreira; Beatriz H. Fuck



Acute attacks in the extremities of persons living in an area endemic for bancroftian filariasis: differentiation of two syndromes  

Microsoft Academic Search

The natural history of lymphatic disease in human filariasis remains unclear, but recurrent episodes of acute lymphangitis are believed to constitute a major risk factor for the development of chronic lymphoedema and elephantiasis. Prospective analysis of 600 patients referred to the filariasis clinic of the Centro de Pesquisas Aggeu Magalhães\\/FIOCRUZ in Recife, Brazil, indicated that 2 distinct acute syndromes accompanied

Gerusa Dreyer; Zulma Medeiros; Maria José Netto; Nilma Cintra Leal; Luiz Gonzaga de Castro; Will F. Piessens



CILA: A New Approach to Problems in the Acquisition of Latin American Library Materials.  

National Technical Information Service (NTIS)

This paper attempts to provide a contextual study of CILA--Centro Interamericano de Libros Academicos--a new scheme for the distribution of scholarly books in the Americas. Because of the scheme's peculiar relevance to the needs of Canadian academic libra...

J. S. Clouston



Outreach to Future Hispanic Educational Leaders.  

ERIC Educational Resources Information Center

This paper discusses issues related to the recruitment of Hispanic-American educational leaders, focusing on the El Centro de Recursos Educativos outreach center at Northeastern Illinois University in Chicago, which began operation in Fall 1997. It examines the characteristics of successful programs for Hispanic recruitment and retention and the…

Serafin, Ana Gil


Radar cross section measurements (8-12 GHz) of flat plates painted with microwave absorbing materials  

Microsoft Academic Search

The aim of the present work is to present radar cross section measurements of flat plates painted with radar absorbing material (RAM) in the range of 8-12 GHz. The measurements were carried out in an anechoic chamber at Centro Tecnico Aeroespacial (CTA)-Ministerio da Defesa facilities, and the RAM coating was manufactured at Divisao de Materiais of Instituto de Aeronautica e

M. C. Rezende; I. M. Martin; M. A. S. Miacci; E. L. Nohara



CATIE: Tropical Agricultural Research and Higher Education Center.  

ERIC Educational Resources Information Center

This article features CATIE (Centro Agronomico Tropical de Investigacion y Ensenanza), a tropical agricultural research and higher education center. CATIE's mission is to be instrumental in poverty reduction and rural development in the American tropics, by promoting diversified and competitive agriculture and sustainable management of natural…

Applied Environmental Education and Communication, 2004



A Gait Analysis Laboratory for Rehabilitation of Patients with Musculoskeletal Impairments  

Microsoft Academic Search

This paper describes the technology (software & hardware) used in the Gait Analysis Labora- tory of CRPG - Centro de Reabilitação Profissional de Gaia. This laboratory is mainly intended to support CRPG with quantitative data for clinical rehabilitation of patients with musculoskeletal pathologies, namely in the lower limbs. Usually, for the gait analysis is considered data obtained from several acquisition

Daniela Sofia; S. Sous; Miguel Velhote Correia; Jorge G. Barbosa; Carolina Vila Chã; Emília Mendes


Métodos para atrair e repelir a abelha Apis mellifera (L.) em cultura de maracujá amarelo (Passiflora edulis flavicarpa flavicarpa Deg.)  

Microsoft Academic Search

Methods to attract and repel Africanize honey bees Apis mellifera, L., to passion fruit (Passiflora edulis flavicarpa flavicarpa Deg.). This experiment was carried out at Centro Universitário Moura Lacerda, Ribeirão Preto, state of São Paulo, Brazil, to study Africanized honey bee (Apis mellifera L.) attractives and repellents in vitro, in tubes and on passion fruit flowers (Passiflora edulis flavicarpa flavicarpa

Darclet Terezinha Malerbo Souza; André Charlier; Marta Maria Rossi; Alexandre De Sene Pinto; Regina Helena Nogueira-Couto



The 2011 International Association of Breath Research (IABR) meeting in Parma, Italy: a collection of comments from attendees  

Microsoft Academic Search

ForewordThe 2011 Conference 'Breath Analysis Summit' was hosted by Antonio Mutti and Massimo Corradi, professors from the University of Parma, Italy. It was held at the Centro Congressi di Parma (Conference Center) in Parma. This was our highest attended breath conference to date, and by all measures, extremely successful. For this editorial the authors solicited comments from the attendees and

Joachim D Pleil; Anton Amann



Organizing MySpace: Youth Walkouts, Pleasure, Politics, and New Media  

ERIC Educational Resources Information Center

While the major urban centers around the country were flooded by millions of protesters demanding immigrant rights in March 2006, the San Francisco Bay Area remained relatively quiet. A coalition of organizers, including Centro Legal de la Raza, Deporten A La Migra, and the Bay Area Immigrant Rights Coalition mobilized a one-week hunger strike,…

Yang, K. Wayne



Geothermal district heating systems  

NASA Astrophysics Data System (ADS)

Ten district heating demonstration projects and their present status are described. The projects are Klamath County YMCA, Susanville District Heating, Klamath Falls District Heating, Reno Salem Plaza Condominium, El Centro Community Center Heating/Cooling, Haakon School and Business District Heating, St. Mary's Hospital, Diamond Ring Ranch, Pagosa Springs District Heating, and Boise District Heating.

Budney, G. S.; Childs, F.



Geothermal district heating systems  

SciTech Connect

Ten district heating demonstration projects and their present status are described. The projects are Klamath County YMCA, Susanville District Heating, Klamath Falls District Heating, Reno Salem Plaza Condominium, El Centro Community Center Heating/Cooling, Haakon School and Business District Heating, St. Mary's Hospital, Diamond Ring Ranch, Pagosa Springs District Heating, and Boise District Heating.

Budney, G.S.; Childs, F.



Geothermal district heating systems  

Microsoft Academic Search

Ten district heating demonstration projects and their present status are described. The projects are Klamath County YMCA, Susanville District Heating, Klamath Falls District Heating, Reno Salem Plaza Condominium, El Centro Community Center Heating\\/Cooling, Haakon School and Business District Heating, St. Mary's Hospital, Diamond Ring Ranch, Pagosa Springs District Heating, and Boise District Heating.

G. S. Budney; F. Childs




Microsoft Academic Search

This paper presents the comparison between the Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (INMETRO, Brazil) and the Centro Nacional de Metrología (CENAM, Mexico) on barometric pressure in the range from 80 kPa up to 115 kPa. This comparison was carried out at the end of 2004 and has been entered within the data base of the Sistema Interamericano

Jorge C. Torres-Guzmán; Pablo Olvera-Arana; Luiz H. Paraguassú; Paulo R. G. Couto


In-Course Instructor-Guided Service Learning in a Community College General Psychology Class  

ERIC Educational Resources Information Center

|Students enrolled in two general psychology classes at El Centro College (ECC) of the Dallas County Community College District (DCCCD) were offered the opportunity to earn extra credit by performing up to 20 hours of service learning. Benefits of service learning were observed in student development, including exploration of career possibilities,…

Goomas, David T.; Weston, Melissa B.



66 FR 8650 - Endangered and Threatened Wildlife and Plants; Final Determination of Critical Habitat for...  

Federal Register 2010, 2011, 2012, 2013

...Coachella Valley, Anza-Borrego Desert, and Salton Trough. Critical habitat is designated...U.S.A. (western U.S.A. (CA) E 634 17.95(a) NA conterminous Peninsular...Borrego Valley (1982), El Cajon (1979), Salton Sea (1982), and El Centro...



Úlcera de perna: um estudo de casos em Juiz de Fora-MG (Brasil) e região* Leg ulcer: an observational study in Juiz de Fora, MG (Brazil) and region  

Microsoft Academic Search

Resumo: FUNDAMENTOS: Úlcera de perna (UP) caracteriza-se por perda do tegumento nas extremidades dos membros inferiores causada geral- mente por disfunção vascular. O BJETIVOS: Caracterizar clínica e epidemiologicamente a amostra populacional com UP atendida nos centros de saúde de Juiz de Fora. PACIENTES E MÉTODOS: Submetidos ao protocolo clínico 124 pacientes com UP, de Juiz de Fora e região de

Marco Andrey; Cipriani Frade; Igor Brum Cursi; Felipe Fortes Andrade; Samara Casemiro Soares; Sandro V. Santos; Norma Tiraboschi Foss


La pizarra digital y sus posibilidades en el mundo educativo  

Microsoft Academic Search

Nuevos aprendizajes y nuevas mentes, llevan consigo la necesidad de profundizar en la metodología a la hora de innovar y de aplicar las nuevas tecnologías en el aula. La inquietud de un grupo cada vez más numeroso de profesores, junto a las tímidas aproximaciones de las diversas administraciones a la hora de dotar a los centros con nuevas tecnologías, hace

Ramón Domenech




Microsoft Academic Search

Passive, active and hybrid vibration control of structures during earthquakes were studied. Particular attention was given to hybrid preview control strategy for protection of structures against earthquakes. A three-story building under fixed-base condition and with laminated rubber bearing base isolation system subject to the El Centro 1940 earthquake were analyzed. The cases that an active control system with and without

J. Marzbanrad; G. Ahmadi


Charting a New Course: Understanding the Sociocultural, Political, Economic and Historical Context of Latino/a Education in the United States  

ERIC Educational Resources Information Center

The work of addressing the challenge of the education of Latinos/as has begun through, among other efforts, the National Latino/a Education Research and Policy Project, or NLERAP. Beginning in 2000 as a national initiative of the Centro de Estudios Puertorriquenos at Hunter College, NLERAP's goal has been to add multiple Latino/a perspectives to…

Cammarota, Julio; Cannella, Chiara; Garcia, Emmanuel; Gonzalez, Maria; Irizarry, Jason G.; Moll, Luis C.; Nieto, Sonia; Pedraza, Pedro; Perez, Beatrix; Quinones, Sandra; Rivera, Melissa; Romo, Harriett; Valenzuela, Angela



A Study of the Feasibility of Mechanized Adobe Production.  

National Technical Information Service (NTIS)

The general purpose of this study is to determine the economic feasibility of the Centro de Adobes concept, considered an Economic Opportunity Development for the poor. The project designers see the creation of from 15 to 30 new jobs per manufacturing cen...



European Corporate Laws, Regulatory Competition and Path Dependence  

Microsoft Academic Search

Beyond the well-known discussion in regard to the Cassis de Dijon of the European Court of Justice, implying the mutual recognition of national product regulations, the topic of mutual recognition and regulatory competition has emerged again in the realm of European corporate laws (“Centros” of the ECJ in 1999). Can effective competition among European corporate laws be expected? In the

Klaus Heine; Wolfgang Kerber



Georadar Archaeological Prospection at the Historical Center of the Merida City, Yucatan, Mexico  

Microsoft Academic Search

This paper shows the results of the georadar archaeological prospection carried out by the Laboratorio de Prospección Arqueologica from the Instituto de Investigaciones Antropologicas (IIA) of the Universidad Nacional Autonoma de Mexico (UNAM) verifing the archaeological and historical information recovered by the Departamento de Patrimonio Arqueologico y Natural del Municipio (DPANM) del Ayuntamiento de Merida en el Centro Histerico de

L. Barba; A. Ortiz; J. Blancas; J. Ligorred



Role of a Research Nuclear Reactor within the Framework of Mineral Prospection and Processing Programs.  

National Technical Information Service (NTIS)

The Empresas Nucleares Brasileiras S.A. - NUCLEBRAS own the only TRIGA MARK I nuclear reactor in Brazil, which is in operation at the Centro de Desenvolvimento da Tecnologia Nuclear - CDTN, in Belo Horizonte. This reactor has been in operation since 1960 ...

P. Carvalho Tofani R. Stasiulevicius C. V. S. Sabino F. Maretti



CATIE: Tropical Agricultural Research and Higher Education Center.  

ERIC Educational Resources Information Center

|This article features CATIE (Centro Agronomico Tropical de Investigacion y Ensenanza), a tropical agricultural research and higher education center. CATIE's mission is to be instrumental in poverty reduction and rural development in the American tropics, by promoting diversified and competitive agriculture and sustainable management of natural…

Applied Environmental Education and Communication, 2004



Riemann Zeros and the Inverse Phase Problem  

NASA Astrophysics Data System (ADS)

Finding a universal method of crystal structure solution and proving the Riemann hypothesis are two outstanding challenges in apparently unrelated fields. For centro-symmetric crystals however, a connection arises as the result of a statistical approach to the inverse phase problem. It is shown that parameters of the phase distribution are related to the non-trivial Riemann zeros by a Mellin transform.

Tourigny, David S.



Tabanidae (Diptera) of Maranh?o state, Brazil. V. Description of Protosilvius gurupi sp. n. (Pangoniinae, Pangoniini) and key to Protosilvius species  

PubMed Central

Abstract Protosilvius gurupi sp. n. (Tabanidae, Pangoniinae) is described and illustrated based on seven female and 53 male specimens collected in the Amazonian region at Reserva Biológica Gurupi, Centro Novo do Maranhão municipality, northwest Maranhão, Brazil. This is the first record of Protosilvius in northern Brazil and in the Amazon Basin. An illustrated key to all Protosilvius species is also presented.

Rafael, Jose Albertino; Marques, Dayse Willkenia Almeida; Limeira-de-Oliveira, Francisco




Microsoft Academic Search

This paper reviews the results of past research conducted from 1965 to 2000 in two major cassava growing areas, the northeastern and eastern parts of Thailand. This research was carried out by the Field Crops Research Institute, Department of Agriculture (DOA), in collaboration with Kasetsart University and the Centro Internacional de Agricultura Tropical CIAT). The major achievements are described under

Anuchit Tongglum; Preecha Suriyapan; Reinhardt H. Howeler


Helping English Learners Increase Achievement Through Inquiry-Based Science Instruction  

Microsoft Academic Search

This study summarizes the results of a four-year project in science education conducted in a rural setting with English learners in grades K-6 in the El Centro Elementary School District in southern California. Data were collected to measure student achievement in science, writing, reading, and mathematics for participating students. These data were analyzed relative to the number of years that

Olga Maia Amaral; Leslie Garrison


Dieta cetogênica e dieta de Atkins modificada no tratamento da epilepsia refratária em crianças e adultos  

Microsoft Academic Search

RESUMO Introdução: A dieta cetogênica (DC) e a dieta de Atkins modificada (DAM) são dietas terapêuticas mun- dialmente utilizadas no tratamento da epilepsia refratária em crianças e adultos. No Brasil estas modalidades de tratamento são pouco indicadas, restringindo a poucos centros. Metodologia: Revisão de literatura sobre a utilização da DC e DAM no tratamento da epilepsia refratária. Conclusões: A DC

Luciana Midori Inuzuka-Nakaharada



Gene function analysis in extremophiles: the  

Microsoft Academic Search

In Centro de Astrobiologia it has been considered the Tinto river as a model ecosystem to study life based on iron. The final goal is to study the biological and metabolic diversity in microorganisms living there, following a genomic approach, to get insights to the mechanisms of adaptation to this environment. The Gram-negative bacterium Leptospirillum ferrooxidans is one of the

Victor Parro; Mercedes Moreno-Paz



The role of Amazonian rivers for wintering ospreys (Pandion haliaetus): clues from North American band recoveries in Brazil between 1937 and 2006  

Microsoft Academic Search

In this paper we describe band-recovery data from 90 ospreys (Pandion haliaetus), banded in North America and recovered in Brazil between 1937 and 2006. Data were obtained from the Bird Banding Laboratory (US Geological Survey, USA) and from the Centro Nacional de Pesquisa para Conservação das Aves Silvestres (IBAMA, Brazil). The majority of ospreys were banded near the coast in

Luiz A. M. Mestre; Richard O. Bierregaard Jr



Promoting Entrepreneurial Culture in the University: The Institutional Collaborative Model at the Universidad Autonoma de Madrid  

ERIC Educational Resources Information Center

|This paper presents a case of collaboration between different types of public services and the private sector for the promotion of an entrepreneurial culture. This collaboration is achieved by means of a centre established and developed by the Universidad Autonoma de Madrid, the Centro de Iniciativas Emprendedoras (the Centre for Entrepreneurial…

de Pablo, Isidro; Alfaro, Fernando; Rodriguez, Miriam; Valdes, Esperanza



Biofuels and fossil fuels: Life Cycle Analysis (LCA) optimisation through productive resources maximisation  

Microsoft Academic Search

Life Cycle Analyses (LCA) are used to compare biofuels to fossil fuels. These analyses are made according to the ISO 14040-43 standards, which using a defined unit compare mass and energy balances for two or more comparison objects.In Spain, the Spanish government Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, has performed two LCA's in order to compare ethanol and

Fernando Hernández Sobrino; Carlos Rodríguez Monroy; José Luís Hernández Pérez



Sensibilidade a antimicrobianos de bactérias isoladas do trato respiratório de pacientes com infecções respiratórias adquiridas na comunidade: resultados brasileiros do Programa SENTRY de Vigilância de Resistência a Antimicrobianos dos anos de 1997 e 1998  

Microsoft Academic Search

O tratamento da pneumonia adquirida na comunidade (PAC) é habitualmente empírico e o uso de antimicrobianos é baseado em estudos de vigilância. O programa SENTRY foi desenhado para monitorar a resistência a antimicrobianos através de uma rede internacional de laboratórios. Três centros no Brasil participaram do Programa SENTRY em 1997 e em 1998. Métodos: Um total de 344 isolados bacterianos




Imagining the Mexican Immigrant Worker: (Inter)Nationalism, Identity, and Insurgency in the Chicano Movement in Los Angeles.  

ERIC Educational Resources Information Center

|Traces the history of two organizations of the 1970s Chicano Movement: the Committee to Free Los Tres and the Centro de Accion Social Autonomo (CASA). Discusses their Marxist ideology, notion of Chicano cultural nationalism, involvement of college students and other youth, campaigns supporting immigrant workers' rights and affirmative action at…

Chavez, Ernesto



Fatores que influenciam o prognóstico deambulatório nos diferentes níveis de lesão da  

Microsoft Academic Search

SUMMARY Objective: to determine which factors they influence the prognostic ambulatory for the different levels of injury of the MMC, adding excellent information for the manaje physical therapy. Method: bibliographical revision through books that are part of the quantity of the Padre Innocente Radrizzani library of the Centro Universitário São Camilo and scientific articles searched by the databases Medline and

Ramos FS; Macedo LK; Scarlato A; Herrera G


Optical Second-Harmonic Generation from Submonolayer Na-Covered Ge Surfaces.  

National Technical Information Service (NTIS)

Optical second harmonic generation (SHG) from centro-symmetric crystals is restricted to the surface. It is found that submonolayers of Na on Ge caused drastic increases in SHG. The different effects of Na on SHG of Ge(111) and Ge(100) were correlated wit...

C. H. Lee C. S. Wang J. M. Chen J. R. Bower



Optical Second Harmonic Generation from Surfaces.  

National Technical Information Service (NTIS)

Optical second harmonic generation (SHG) from centro-symmetric crystals is restricted to the surface. A free electron model is used to derive the relevant source terms in the nonlinear polarization. Results of SHG from alkali metal covered surfaces of GE,...

J. M. Chen J. R. Bower C. S. Wang



Experimental evaluation of rainwater quality for non-potable applications in the city of São Paulo, Brazil  

Microsoft Academic Search

This study summarizes the evaluation of rainwater quality and its potential for non-potable applications in the city of São Paulo, Brazil. An experimental system was installed at the Centro de Técnicas de Construção Civil (Civil Construction Techniques Centre, Escola Politécnica, University of São Paulo) such that analysis of the physical, chemical and bacteriological composition of rainwater—total and faecal coliforms, Clostridium

Simone May; Racine T. A. Prado



La representación social que orienta las decisiones paternas al afrontar el consumo de drogas de sus hijos  

Microsoft Academic Search

Objective. To identify the social representation guiding decisions of parents of teenage drug users to face consumption of their children. Material and Methods. A qualitative study using free lists, characterization questionnaires, and in-depth interviews was performed among 60 systematically selected parents of young drug users who were receiving treatment in Centros de Integración Juvenil. Data analysis included correlations and interpretive

Bertha Lidia Nuño-Gutiérrez; Catalina González-Forteza



Object-oriented modelling and simulation of ACUREX solar thermal power plant  

Microsoft Academic Search

Research and development of advanced control systems to optimize the overall performance of parabolic trough collector (PTC) solar power plants is a priority line of research at the CIEMAT (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas - Research Centre for Energy, Environment and Technology). These developments are underway at the CIEMAT's Plataforma Solar de Almera (PSA), a highly specialized solar

L. J. Yebra; M. Berenguel; J. Bonilla; L. Roca; S. Dormido; E. Zarza



Sexual Abuse Experiences of Women in Peru: An Exploratory Study  

ERIC Educational Resources Information Center

|This ethnographic study relied primarily on case notes and interviews with the president of Centro Prenatal Vida Nueva, a pregnancy center in Lima, Peru, to study the sexual abuse experiences of 33 Peruvian women. Given the language limitations of the researchers, the analyses were completed in collaboration with the president of the center, a…

Deboer, Rebekah E.; Tse, Luke M.



Avaliação dos Efeitos da Radiação Gama nos Teores de Carotenóides, Ácido Ascórbico e Açúcares do Fruto Buriti do Brejo (Mauritia flexuosa L.)  

Microsoft Academic Search

RESUMO Buriti do Brejo (Mauritia flexuosa L.) é um típico fruto da Amazônia, Nordeste e Centro-Oeste brasileiro, muito utilizado na culinária para produção de sucos, doces e vinhos. É considerado uma excelente fonte de carotenóides precursores da vitamina A, apresentando maior concentração de ?-caroteno. Além dos carotenóides também encontramos ácido ascórbico e açúcares. O ácido ascórbico administrado em quantidades suficientes

Antonio Luís; Santos LIMA; Keila dos Santos; Cople LIMA; Maysa Joppert COELHO; Jaqueline Michele



Diagnosis of Neospora caninum in bovine fetuses by histology, immunohistochemistry, and nested-PCR  

Microsoft Academic Search

Neospora caninum, a cause of abortion and stillbirth in cattle, was studied by histology, immunohistochemistry, and nested-PCR, using primers from the Nc5 region of the genomic DNA (PCR PLUS) and primers from the ITS1 region of the ribosomal DNA (PCR JB). A total of 105 fetal samples sent to the Centro de Pesquisa e Desenvolvimento de Sanidade Animal do Instituto

Aline Diniz Cabral; Clarice Neves Camargo; N. T. C. Galleti; L. H. Okuda; E. M. Pituco; C. Del Fava



Macro Volatility and Financial Institutions  

Microsoft Academic Search

In 2004, with support from IDRC, CEDES (Centro de Estudios de Estado y Sociedad) launched a global project to generate proposals for the reform of national financial institutions in developing countries, and for the building of global and regional financial architectures needed to support their development. Specialized teams led by local researchers from Thailand, China, South Africa, Nigeria, Russia, Brazil,

José María Fanelli


Experience of disused source management in Latin America  

Microsoft Academic Search

The Centro de Desenvolvimento da Tecnologia Nuclear (Center for the Development of Nuclear Technology) - CDTN - has been actively engaged in cooperation programs for disused source management throughout the Latin American and the Caribbean region since 1996. The CDTN source conditioning team participated in the preparation of the technical procedures established for the different tasks involved in the radium

Pimenta Mourao



Efeitos da dieta irradiada sobre a longevidade e prolificidade em geracoes sucessivas de Zabrotes subfasciatus (Boheman, 1833) (Coleoptera, Bruchidae). (Effects of irradiated diet on longevity and prolificity of successive generations of Zabrotes subfasciatus (Boheman, 1833) (Coleoptera, Bruchidae)).  

National Technical Information Service (NTIS)

The study was done in the laboratory of Entomology of the Centro de Energia Nuclear na Agricultura (CENA), University of Sao Paulo, in Piracicaba, State of Sao Paulo, Brazil. This research was carried out to observe the effect of irradiated beans (Phaseol...

R. E. Domarco



On A Real-valued EVD Approach to Cyclic DOA Estimation  

Microsoft Academic Search

By exploiting the real-valued eigen decomposition (EVD) of the centro-Hermitian matrix, a novel cyclic MUSIC algorithm with signal selective property is presented by introducing a new forward backward smoothed covariance matrix. Compared with cyclic MUSIC algorithm, the proposed approach has a better performance in the presence of multipath propagation. In addition, this approach not only reduces the computational complexity, but

Zhigang Liu; Jinkuan Wang; Yanbo Xue



i-Farm: A exploração agrícola inteligente da sociedade da informação e do conhecimento  

Microsoft Academic Search

Resumo A evolução que se tem vindo a observar no campo das tecnologias de informação e comunicação, em particular no que se refere à computação móvel e da monitorização remota, vem colocar um desafio extremamente interessante ao sector agrícola. Esta nova realidade coloca o conhecimento agronómico no centro das atenções, uma vez que estas tecnologias não fazem mais do que

Miguel de Castro Neto; Luís Miguel Fernandes


Charting a New Course: Understanding the Sociocultural, Political, Economic and Historical Context of Latino/a Education in the United States  

ERIC Educational Resources Information Center

|The work of addressing the challenge of the education of Latinos/as has begun through, among other efforts, the National Latino/a Education Research and Policy Project, or NLERAP. Beginning in 2000 as a national initiative of the Centro de Estudios Puertorriquenos at Hunter College, NLERAP's goal has been to add multiple Latino/a perspectives to…

Cammarota, Julio; Cannella, Chiara; Garcia, Emmanuel; Gonzalez, Maria; Irizarry, Jason G.; Moll, Luis C.; Nieto, Sonia; Pedraza, Pedro; Perez, Beatrix; Quinones, Sandra; Rivera, Melissa; Romo, Harriett; Valenzuela, Angela



Potential threat of malaria epidemics in a low transmission area, as exemplified by São Tomé and Príncipe  

Microsoft Academic Search

BACKGROUND: Plasmodium falciparum is the major cause of malaria infection in the island of São Tomé, in the Republic of São Tomé and Príncipe (STP), with an incidence of 40 - 50% before 2004. Since 2004, through the coordination of the Ministry of Health of STP and their Centro Nacional de Endemias (CNE), an integrated malaria control programme has been

Pei-Wen Lee; Chia-Tai Liu; Virgilio E do Rosario; Bruno de Sousa; Herodes Sacramento Rampao; Men-Fang Shaio



UMA EXPERIÊNCIA COM O PROJETO MANHATTAN NO ENSINO FUNDAMENTAL An experience with the Manhattan Project in the Elementary School  

Microsoft Academic Search

Resumo: O presente artigo discute uma dissertação de mestrado que utilizou uma perspectiva educacio- nal voltada à formação de cidadãos e defendida na proposta de Edgar Morin e no relatório da UNESCO sobre educação para o século XXI. Para isso, aborda a importância de uma nova prática escolar, preocupa- da em manter o estudante como centro das atividades em sala

Rafaela Samagaia; Luiz O. Q. Peduzzi


Las habilidades comunicativas en estudiantes de la especialidad contabilidad y finanzas: una propuesta de actuación  

Microsoft Academic Search

Las instituciones universitarias están llamadas a formar profesionales que darán continuidad a la obra social que construimos. La imagen del mismo lleva implícita el dominio de una serie de cualidades que le permitan expresarse correctamente. Un reciente estudio realizado a futuros graduados de quinto año en la especialidad Contabilidad y Finanzas del Centro Universitario Municipal de Lajas acerca del desarrollo

Daylin Yera Jacomino



El acoso escolar. ¿Cómo afrontarlo?  

Microsoft Academic Search

A través de este trabajo se trata de reflexionar sobre los diferentes problemas que pueden provocar el acoso o bullying en el alumnado. En nuestros centros educativos cada día aparecen más casos de bullying, y aún no se afrontan de forma adecuada estas situaciones. La sociedad está cambiando y esto se refleja en el campo educativo. Es necesario que el

María José Vázquez Clavijo



The Integration of the Information and Communication Functions, and the Marketing of the Resulting Products.  

ERIC Educational Resources Information Center

Discusses the theoretical basis for integration of information functions and communication functions, the relevance of this integration in the scientific information cycle, and its positive effect on commodity research networks. The application of this theory is described using three commodity programs of the Centro Internacional de Agricultura…

Harris, Susan C.




Microsoft Academic Search

The first facility using fast pyrolysis principle in Brazil is described here. The country has a long time experience in wood carbonisation and is the biggest charcoal producer in the world with an annual production of 12 million tonnes produced in traditional mansory kilns. The demonstration fast pyrolysis plant to biomass conversion is located at the Centro de Tecnologia Copersucar

J. D. Rocha; E. Olivares Gómez; J. M. Mesa Pérez; L. A. B. Cortez; O. Seye; L. E. Brossard González


Interview: Fighting disease from the chromosome end.  


Maria A Blasco obtained her PhD in 1993 for her research at the Centro de Biología Molecular 'Severo Ochoa' (Madrid, Spain) under the supervision of M Salas. That same year, Blasco joined the Cold Spring Harbor Laboratory in New York (NY, USA) as a Postdoctoral Fellow under the leadership of CW Greider. In 1997 she returned to Spain to start her own research group at the Centro Nacional de Biotecnología in Madrid. She joined the Centro Nacional de Investigaciones Oncológicas in 2003 as Director of the Molecular Oncology Programme and Leader of the Telomeres and Telomerase Group, and was appointed Centro Nacional de Investigaciones Oncológicas Director in 2011. Blasco has received the Josef Steiner Cancer Research, Rey Jaime I, Körber European Science, Alberto Sols and Fundación Lilly Precilinical Research Awards, as well as the Spanish National Santiago Ramón y Cajal Research Award in Biology (2010). Blasco has also been awarded the EMBO Gold Medal and has served on its Council since 2008. PMID:24059795

Blasco, Maria A



Guadalupian Symposium. Held in Alpine, Texas on March 13-15, 1991.  

National Technical Information Service (NTIS)

The internal stratigraphy of the Cutoff Formation in the Guadalupe Mountains is clarified, and the unit is divided into three members: the Shumard Canyon, the El Centro, and the Williams Ranch members. The Shumard Canyon correlates to the upper part of th...

B. R. Wardlaw D. M. Rohr R. E. Grant




Microsoft Academic Search

The Brazilian research center CDTN - Centro de Desenvolvimento da Tecnologia Nuclear - has been carrying out research on the incorporation of radioactive wastes in different types of bitumen, aiming to obtain monolithic, homogeneous, chemically and mechanically stable waste forms. The solidification of waste is mandatory if compliance with the safety standards for transport, storage and disposal are sought. The

Marcia Flavia; Righi Guzella; Tânia Valéria da Silva


Estudio para la prevención del cáncer necesita voluntarias: El Estudio del Tamoxifeno y Raloxifeno (STAR) se realiza en Norteamérica

El Estudio del Tamoxifeno y Raloxifeno (STAR, por sus siglas en inglés), uno de los estudios más importantes realizados para la prevención del cáncer del seno, está ahora reclutando voluntarias en más de 400 centros en los Estados Unidos, Puerto Rico y Canadá.


Puerto Rican Women as Workers and Writers.  

ERIC Educational Resources Information Center

|This theme issue of the "Centro Bulletin" highlights recent studies by and about employed Puerto Rican and Latina women. "La mujer en el Puerto Rico del siglo XIX" (O. Jimenez de Wagenheim), in Spanish, reviews the contributions of women to Puerto Rican economic, political, and social life during the nineteenth century. "Notas sobre el desarrollo…

Vazquez, Blanca, Ed.



Development of an inactivated candidate vaccine against Chandipura virus (Rhabdoviridae: Vesiculovirus).  


A Vero cell based vaccine candidate against Chandipura (CHP) virus (Rhabdoviridae: Vesiculovirus), was developed and evaluated for immunogenicity in mice. Virus was purified by ultracentrifugation on 30% glycerol cushion followed by differential centrifugation on 10-60% sucrose gradient and inactivated with ?-propio lactone at a concentration of 1:3500. The inactivated product was blended with aluminium phosphate (3%) and immunized 4-week-old Swiss albino mice. Neutralizing antibodies in the range of 1:10 to 160 and 1:80 to 1:320 was detected with 85% and 100% sero-conversion after 2nd and 3rd dose, respectively. All the immunized mice with antibody titer above 1:20 survived live virus challenge. The vaccine candidate has potential to be an efficient vaccine against CHP virus. PMID:21549791

Jadi, R S; Sudeep, A B; Barde, P V; Arankalle, V A; Mishra, A C



Dinámica de planetas extrasolares resonantes  

NASA Astrophysics Data System (ADS)

Actualmente se han detectado 117 planetas alrededor de estrellas de Secuencia Principal, incluyendo 12 sistemas planetarios, cada uno con dos o tres miembros. De estos últimos, ocho poseen planetas en órbitas próximas y sus perturbaciones gravitacionales se convierten en un factor fundamental para la estabilidad orbital del sistema. Todos se encuentran en configuraciones resonantes, desde la conmensurabilidad de movimientos 2/1 de Gliese 876, hasta la resonancia secular de Ups And. En esta presentación analizamos varios aspectos de la dinámica resonante de los planetas extrasolares, incluyendo la existencia de soluciones de equilibrio, construcción de modelos analógicos y métodos para la determinación de masas individuales. También discutimos por qué las resonancias son tan frecuentes en estos sistemas, comparado con nuestro propio Sistema Solar. Por último, intentamos relacionar estos modelos con la hipótesis de migración planetaria, buscando límites en su extensión y en los posibles mecanismos que le dieron origen.

Beauge, C.


Curva de rotación de la Galaxia Eso 321-25  

NASA Astrophysics Data System (ADS)

Se presenta la curva de rotación de esta galaxia, generada a partir de espectros obtenidos con el Espectrógrafo Multifunción del telescopio de 1.54 m de Bosque Alegre. El análisis de las curvas de velocidad radial obtenidas muestra que el núcleo no coincide con el centro de simetría de las mismas, lo que es consistente con el aspecto morfológico exhibido por la galaxia en imágenes de banda ancha. En estas últimas, el núcleo muestra una estructura peculiar y no coincidiría con el centro geométrico del disco aparente. Los flujos relativos de líneas (H? /[NII]? 6583 y [SII]? 6731/? 6716) indicarían niveles de excitación y densidad electrónica normales en regiones HII, aún en la zona nuclear. Este trabajo forma parte de un programa de estudio de cinemática, excitación y densidad electrónica del gas ionizado en galaxias peculiares del Atlas de Galaxias Australes de Sérsic.

Díaz, R.; Carranza, G.; Ahumada, J.; Arreguine, V.


Improved estimation of the mass balance of the glaciers draining into the Amundsen Sea sector of West Antarctica from the NASA\\/CECS 2002 campaign  

Microsoft Academic Search

In November-December 2002, a joint airborne experiment by Centro de Estudios Cientificos and NASA flew over the Antarctic ice sheet to collect laser altimetry and radio-echo sounding data over glaciers flowing into the Amundsen Sea. A P-3 aircraft on loan from the Chilean Navy made four flights over Pine Island, Thwaites, Pope, Smith and Kohler glaciers, with each flight yielding

Eric Rignot; R. H. Thomas; Pannir Kanagaratnam; Gino Casassa; Earl Frederick; Sivaprasad Gogineni; William Krabill; Andrès Rivera; Robert Russell; John Sonntag; Robert Swift; James Yungel



Patrones alimenticios y valoración del estado nutricional en población adulta atendida en la Atención Primaria  

Microsoft Academic Search

INTRODUCCIÓN: Los patrones alimenticios influyen en la salud del momento y pueden determinarla a largo plazo.\\u000aOBJETIVOS: Identificar los hábitos alimenticios y el estado nutricional de la población entre 18 y 44 años de edad atendida en un centro de atención primaria y estudiar los factores asociados.\\u000aTIPO DE ESTUDIO: Transversal.\\u000aEMPLAZAMIENTO: Área básica urbana.\\u000aSUJETOS: Muestra aleatoria de 201

Matilde González Solanellas; Marta Puig Soler; Ana Romagosa Perez-Portabella; Clàudia Caselles Montagut; Montserrat Grau Carod; Hegoi Segurola Gurrutxaga; Santiago Lancho Lancho; Edurne Zabaleta del Olmo



Crystal structures of metal–organic frameworks sustained by ?–? interactions between triple-helices  

Microsoft Academic Search

(4), achieved from triple metal helical iron complex Fe2L3, were assembled in the solvents of diethyl ether\\/DMF, pyridine, benzene and THF, respectively, where H2L is one of the simplest imine-based ligands {((C6H4)(OH))CHN- NCH((OH)(C6H4))}. Compounds 1, 2, 3 and 4 all crystallize in a centro-symmetric space group, consequently the molecules occur as a racemic mixture of ?-? and ?-? configuration enantiomers,

Mo Hong; Fang Chen-jie; Duan Chun-ying; Li Yu-ting; Meng Qing-jin



Reference karyotype and cytomolecular map for loblolly pine ( Pinus taeda L.)  

Microsoft Academic Search

A reference karyotype is presented for loblolly pine (Pinus taeda L., subgenus Pinus, section Pinus, subsection Australes), based on fluorescent in situ hybridization (FISH), using 18S-28S rDNA, 5S rDNA, and an Arabidopsis-type te- lomere repeat sequence (A-type TRS). Well separated somatic chromosomes were prepared from colchicine-treated root meristems, using an enzymatic digestion technique. Statistical analyses performed on chromosome-arm lengths, centro-

M. Nurul Islam-Faridi; C. Dana Nelson; Thomas L. Kubisiak



Concentric Circular Array for directions of arival estimation of coherent sources with MUSIC algorithm  

Microsoft Academic Search

In this paper, a special design of Uniform Concentric Circular Array (UCCA) is proposed to improve directions of arrival (DoAs) estimation accuracy in fully correlated sources situation. The Centro-symmetry propriety of the introduced antennas shape, as well as each of its subarrays, allow us to develop a Modified Forward\\/Backward Spatial Smoothing technique (MFBSS) to remove signals' coherence. The excellent performances





Microsoft Academic Search

Sommario Nel presente lavoro viene illustrata una procedura di accettazione di ruote ferroviarie trattate, nelle quali la ridotta emissione acustica è ottenuta mediante l'applicazione di uno smorzamento a strato vincolato mediante l'interposizione di un polimero viscoelastico fra il centro ruota ed un pannello di lamiera opportunamente sagomato. La procedura proposta è basata esclusivamente sull'analisi delle ampiezze di vibrazione in condizioni

A. Bracciali; S. Cervello; A. Rossi


Geothermal Information Dissemination and Outreach  

Microsoft Academic Search

Project Purpose ;\\u000a;\\u000aTo enhance technological and topical information transfer in support of industry and government efforts to increase geothermal energy use in the United States (power production, direct use, and geothermal groundsource heat pumps). ;\\u000a;\\u000aProject Work;\\u000a;\\u000aGRC 2003 Annual Meeting. The GRC convened the meeting on Oct. 12-15, 2003, at Morelia's Centro de Convenciones y

Ted J. Clutter



Seeking Life in the Universe  

NASA Astrophysics Data System (ADS)

Seeking Life in the Universe is an outreach project of the Spanish Centro de Astrobiología (CAB). This project is intended to show, through simple and interactive experiments, the main aspects of the scientific activity developed either in the CAB or in a variety of scenarios (e.g. Río Tinto, Antarctica, or the Atacama Desert) in which the scientists study how life evolves or adapts, and to understand how life originated.

Cuesta, L.; Vaquerizo, J. A.; García-Villadangos, M.; García-Descalzo, L.; Pérez-Verde, A.



Bridging the Technology Gap for Low-Income Spanish-Speaking Immigrant Families  

Microsoft Academic Search

Research shows that families have a powerful effect on children's success in school. Parental involvement at home and in school is positively associated with children's school readiness and significant school performance. This study is focused on examining the impact of an intervention technology program-Community Learning Centers-(Centros Comunitarios de Aprendizaje - CCA) designed to assist Spanish-speaking immigrant parents in learning and

Hector Rivera



A graphical installation system for the GNU\\/Linux Debian distribution  

Microsoft Academic Search

One of the main objectives of the Centro di Competenza sul Software Libero del Politecnico di Torino is to provide custom\\u000a GNU\\/Linux distribution to the Public Administration, small and medium enterprise and schools. Debian GNU\\/Linux was choosen\\u000a as the base for the custom distributions because of its strong support of free software and its long-standing technical merits:\\u000a minimalist hardware requirement,

Fiandrotti Attilio; Pierluigi Di Nunzio; Federico Di Gregorio; Angelo Raffaele Meo



Expression of activation-induced cytidine deaminase in human B-cell non-Hodgkin lymphomas  

Microsoft Academic Search

Activation-induced cytidine deaminase (AID) induces somatic hypermutation (SHM), class switch recombination (CSR), and immunoglobulin gene conversion in B-lymphocytes. Here we report for the first time the expression of AID in healthy human B-lymphocytes and in B-cell non- Hodgkin lymphomas (B-NHL). AID mRNA expression in humans is restricted to the CD19CD38IgD germinal center cells, namely the CD19CD38CD44 centro- blasts. After in

Jobst Greeve; Antje Philipsen; Kristina Krause; Wolfram Klapper; Klaus Heidorn; Brian E. Castle; Joe Janda; Kenneth B. Marcu; Reza Parwaresch



Bipolar resectoscope: the future perspective of hysteroscopic surgery  

Microsoft Academic Search

The objective of this study is to prove the effectiveness and security of bipolar resectoscope in hysteroscopic surgery. A\\u000a clinic-based, prospective, non-randomised trial was conducted in Centro Florence di Chirurgia Ambulatoriale, Florence, Italy.\\u000a One hundred fifty-seven women with endocavitary uterine pathologies, such as myoma, polyp, uterine septum and endometrial\\u000a hyperplasia, were included in the study. Myomectomy, polypectomy, metroplasty and endometrial

Luca Mencaglia; Emmanuel Lugo; Sabina Consigli; Cristiana Barbosa



Methicillin-Resistant Staphylococcus aureus Clonal Types in the Czech Republic  

Microsoft Academic Search

Molecular surveillance studies have documented the extensive spread of methicillin-resistant Staphylococcus aureus (MRSA) clones. Studies carried out by Centro de Epidemiologia Molecular-Network for Tracking Gram-Positive Pathogenic Bacteria (CEM\\/NET) led to the identification of two international multidrug- resistant strains, which were designated as the Iberian and Brazilian MRSA clones and which were defined by multiple genomic typing methods; these included ClaI




A Maxwell-Bloch model with discrete symmetries for wave propagation in nonlinear crystals: an application to KDP  

Microsoft Academic Search

This article presents the derivation of a semi-classical model of electromagnetic-wave prop- agation in a non centro-symmetric crystal. It consists of Maxwell's equations for the wave field coupled with a version of Bloch's equations which takes fully into account the discrete symmetry group of the crystal. The model is specialized in the case of a KDP crystal for which information

Christophe Besse; Antoine Bourgeade; Pierre Degond; Olivier Saut



Ultraviolet Radiation Dose National Standard of México  

NASA Astrophysics Data System (ADS)

We present the Ultraviolet (UV) Radiation Dose National Standard for México. The establishment of this measurement reference at Centro Nacional de Metrología (CENAM) eliminates the need of contacting foreign suppliers in the search for traceability towards the SI units when calibrating instruments at 365 nm. Further more, the UV Radiation Dose National Standard constitutes a highly accurate and reliable source for the UV radiation dose measurements performed in medical and cosmetic treatments as in the the food and pharmaceutics disinfection processes, among other.

Cardoso, R.; Rosas, E.



A new four-barrel pellet injection system for the TJ-II stellarator  

Microsoft Academic Search

A new pellet injection system for the T J-II stellarator has been developed\\/constr ucted as part of a collaboration between the Oak Ridge National Laboratory (ORNL) and the Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT). ORNL is providing most of the injector hardware and instrumentation, the pellet diagnostics, and the pellet transport tubes; ClEM AT is responsible for the

S. K. Combs; C. R. Foust; J. M. McGill; L. R. Baylor; J. B. O. Caughman; D. T. Fehling; J. H. Harris; S. J. Meitner; D. A. Rasmussen; K. J. McCarthy; M. Chamorro; R. Garcia; C. Hidalgo; M. Medrano; E. Mirones; J. Olivares; R. Unamuno



Improving weather modeling in South America through IDD-Brasil  

Microsoft Academic Search

The IDD-Brasil constitutes of an international collaboration among Universidade Federal do Rio de Janeiro (LPM\\/UFRJ), Centro de Previsão de Tempo e Estudos Climáticos (CPTEC\\/INPE) and the Unidata Program Center (Unidata\\/UCAR), which connects several universities and research centers across the Americas in a network to share real-time hydro meteorological data. Using this network as a new path to deliver and acquire

G. O. Chagas



A study of migration to Greater Santiago (Chile)  

Microsoft Academic Search

\\u000a Resumen  Se presentan los resultados mas significativos de una encuesta realizada en el Gran Santiago (Chile) en 1962 por el Centro\\u000a Latinamericano de Demografia de las Naciones Unidas (CELADE). La población estudiada era por entonces de, aproximadamente,\\u000a 2.054.000 habitantes. Dieha investigación utilizó una muestra probabílistiea de poco más que 2.000 hogares familiares. Los\\u000a cuestionarios fueron diseñados para investigar características demoqráficas y

Juan C. Elizaga



Benign Childhood Epilepsy with Centra-Temporal Spikes: Quantitative EEG and the Wechsler Intelligence Scale for Children (WISC-III)  

Microsoft Academic Search

Benign childhood epilepsy with centro-temporal spikes (BECTS) is a form of focal idiopathic epilepsy, with seizure remission by the age of 18. Recent studies have suggested that some children with BECTS can suffer from deficits of memory, attention and learning ability and in auditory-verbal and performance sub-tests. On the other hand, alterations in the baseline brain electrical activity determined by

Gloria M. A. S. Tedrus; Lineu C. Fonseca; Josiane M. F. Tonelotto; Rebeca M. Costa; Marcelo G. Chiodi



High yield potential, shuttle breeding, genetic diversity, and a new international wheat improvement strategy  

Microsoft Academic Search

The main elements of the international wheat improvement program of the Centro Internacional de Mejoramiento de Maíz y Trigo\\u000a (CIMMYT), also known as the International Maize and Wheat Improvement Center, have been shuttle breeding at two contrasting\\u000a locations in Mexico, wide adaptation, durable rust and Septoria resistances, international multisite testing, and the appropriate\\u000a use of genetic variation to enhance yield

Rodomiro Ortiz; Richard Trethowan; Guillermo Ortiz Ferrara; Masa Iwanaga; John H. Dodds; Jonathan H. Crouch; Jose Crossa; Hans-Joachim Braun



A 62MeV proton beam for the treatment of ocular melanoma at Laboratori Nazionali del Sud-INFN  

Microsoft Academic Search

At the Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) in Catania, Italy, the first Italian protontherapy facility, named Centro di AdroTerapia e Applicazioni Nucleari Avanzate (CATANA) has been built in collaboration with the University of Catania. It is based on the use of the 62-MeV proton beam delivered by the K=800 Superconducting Cyclotron installed and working at INFN-LNS

G. A. P. Cirrone; G. Cuttone; P. A. Lojacono; S. Lo Nigro; V. Mongelli; I. V. Patti; G. Privitera; L. Raffaele; D. Rifuggiato; M. G. Sabini; V. Salamone; C. Spatola; L. M. Valastro



Implementation of a new Monte Carlo-GEANT4 Simulation tool for the development of a proton therapy beam line and verification of the related dose distributions  

Microsoft Academic Search

Using the Monte Carlo simulation tool GEANT4, we simulated the hadron-therapy beam line of the Centro di AdroTerapia ed Applicazioni Nucleari Avanzate (CATANA) center. This is the unique Italian hadron-therapy facility in which 62-MeV proton beams are used for the radiotherapeutic treatment of choroidal and iris melanomas. All the elements, such as diffusers, range shifters, collimators, and detectors, typical of

G. A. Pablo Cirrone; G. Cuttone; S. Guatelli; S. Lo Nigro; B. Mascialino; M. G. Pia; L. Raffaele; G. Russo; M. G. Sabini



Opera: Objective-Prism Reduction Package  

NASA Astrophysics Data System (ADS)

Surveys of star-forming galaxies are of vital importance to constrain galactic evolution theories. One of the most successful searching methods is the objective-prism (OP) technique, which can register thousands of low resolution spectra in large areas. The UCM-CIDA (Universidad Complutense de Madrid-Centro de Investigación F. J. Duarte) project expects to cover 150 square degrees and detect ˜ 2000 H? emission line galaxies.

García Dabó, C. E.; Gallego, J.



Aspergillosis in Larus cachinnans micaellis : Survey of Eight Cases  

Microsoft Academic Search

Avian aspergillosis is reported in several avian species, with Aspergillus fumigatus as the main aetiological agent. Predisposing factors such as starvation, thermal stress, migratory stress, primary infectious\\u000a disease or toxicosis may play a role. Eight cases of disseminated aspergillosis in free ranging seagulls sheltered at C.R.U.M.A.\\u000a (Centro Recupero Uccelli Marini e Acquatici, Livorno, Italy) with different clinical histories are presented.

Simona Nardoni; Renato Ceccherelli; Giacomo Rossi; Francesca Mancianti



Cyclops - Expert System Shell for the Development of Applications in the Area of Medical Image Analysis  

Microsoft Academic Search

hlmanne-mail: J.Oehlmann@visolution.deKinderklinik Universitt LeipzigDr. Michael Achenbache-mail: Michael.Achenbach@rz.uni-jena.deCDPI - Centro de Diagnostico Medico Por Imagem, Rio de JanairoDr. Romeu Cortes Domingues, Dra. Fabiola Procaci KestelmanSonitec Diagnostico Medico por Imagem Ltda, FlorianopilisDra. Marcella SchaefferDMI - Diagnostico Medico por Imagem Ltda, Sao Jose - SCDr. Luiz Felipe Nobre2. General InformationThe Cyclops Project has been started as a...

Aldo Von Wangenheim; Michael M. Richter; Jorge Muniz Barreto; Dirk Krechel



3-D digital filter design using symmetrical decomposition technique  

Microsoft Academic Search

The authors explore ways of decomposing a 3D response into a number of components and designing a 3D filter by designing each component individually. The authors first list the types of 3D symmetries and antisymmetries that can be present in 3D filter responses. The types of symmetries studied are spatial centro symmetry, single, double, and triple planar quadrantal, diagonal, four-fold

V. Rajaravivarma; P. K. Rajan; H. C. Reddy



Prospective surveillance applying the national nosocomial infection surveillance methods in a Brazilian pediatric public hospital  

Microsoft Academic Search

Background: A hospital-wide, traditional prospective surveillance for nosocomial infections was commenced in 1992 in Centro Geral de Pediatria in Minas Gerais, Brazil, to describe the epidemiology of nosocomial infection in this pediatric hospital and to implement cross-infection prevention and control policies. Methods: We performed a prospective cohort nosocomial infection surveillance of all patients receiving acute care according to the hospital-wide

J. M. M. Lopes; E. Tonelli; J. A. Lamounier; B. R. G. M. Couto; A. L. Siqueira; F. Komatsuzaki; A. P. Champs; C. E. F. Starling



Post-exposure targeting of specific epitopes on ricin toxin abrogates toxin-induced hypoglycemia, hepatic injury, and lethality in a mouse model  

Microsoft Academic Search

Effects in the liver of fatal intoxication with the binary toxin ricin are unclear. We report a robust neutrophil influx into the liver of C57BL\\/6 mice after lethal parenteral ricin challenge, occurring in peri-portal and centro-lobular hepatic areas within 2 h, followed by the abrupt disappearance of hepatic macrophages\\/Kupffer cells. Chemokine profiles determined by microarray, ribonuclease protection assays, northern blotting,

James K Roche; Matthew K Stone; Lisa K Gross; Matthew Lindner; Regina Seaner; Seth H Pincus; Tom G Obrig



A Comprehensive Optical Second Harmonic Generation Study of the Non-Centrosymmetric Character of Biological Structures  

Microsoft Academic Search

The application of optical second harmonic generation (SHG) to the study of non-centro-symmetry in 71 ?-amino acids, 22 dipeptides. 6 tripeptides. 16 proteins, and 5 viruses is reported. All ?-amino acids except ?-glycine, all peptidcs containing at least one enantiomeric ?-amino acid residue, and all proteins and viruses are found to be non-centrosymmetric. Of the 22 racemic ?-amino acids investigated,

M. Delfino



Joint final report on the development of a ductile pipe fracture model  

Microsoft Academic Search

Development of a fundamentally-based fracture propagation analysis model has been undertaken. This report describes progress made in a multi-organizational collaboration involving the Southwest Research Institute (SwRI), Centro Sviluppo Materiali (CSM), and SNAM. Focal point has been SwRi's fluid\\/structure\\/fracture interactive, inelastic-dynamic, computational model for ductile fracture in gas transmission pipelines. Assurance was obtained through quantitative comparisons of crack speeds, pipe wall

M. F. Kanninen; C. P. Leung; P. E. ODonoghue; T. B. Morrow; C. F. Popelar; G. Buzzichelli; G. Demofonti; I. Hadley; L. Rizzi; S. Venzi



Boletín del Instituto Nacional del Cáncer - 07-20-2010

El doctor Harold Varmus, acompañado de su esposa Constance Casey (centro), presta juramento como director del NCI ante la Secretaria del Departamento de Salud y Servicios Humanos, Kathleen Sebelius, el lunes 12 de julio. (Foto cortesía de Chris Smith) El 12 de julio, el doctor Harold Varmus prestó juramento ante la Secretaria del Departamento de Salud y Servicios Humanos de los Estados Unidos, Kathleen Sebelios, como el decimocuarto director del Instituto Nacional del Cáncer.


Effect of shading on growth and dinitrogen fixation of kudzu and tropical pasture legumes  

Microsoft Academic Search

Dry matter production and dinitrogen fixation characteristics in kudzu (Pueraria lobata Ohwi) and some tropical pasture legumes, centro (Centrosema pubescens) and siratro (Macroptilium atropurpureurn cv siratro) were studied under full sunlight and shaded conditions. Nodulating (T202) and nonnodulating (T201) soybean (Glycine max L. Merr.) isolines, were used as reference crops.The results obtained showed that:1. Under full sunlight conditions, the whole

Kounosuke Fujita; Katsushi Matsumoto; Godfred K. Ofosu-Budu; Shoitsu Ogata



Essential oil profiles of new Citrus hybrids, a tool for genetic citrus improvement  

Microsoft Academic Search

The essential oil composition of new Citrus hybrids obtained from the Citrus genetic improvement programs at the CRA-Centro di Ricerche per l’Agrumicoltura e le Colture Mediterranee of Acireale, Italy (CRA-ACM), were used to evaluate the fruit quality and to identify new valuable flavor components. The common objective of genetic improvement programs is to generate Citrus cultivars with a higher resistance

Simona Fabroni; Giuseppe Ruberto; Paolo Rapisarda



Control strategies of a fuel-cell hybrid tramway integrating two dc\\/dc converters  

Microsoft Academic Search

This paper compares two control strategies of a fuel cell (FC)-battery powered hybrid system integrating two dc\\/dc converters for the Metro-Centro tramway (400 kW) from Seville, Spain. Besides, modeling of each component is briefly presented. These models have been implemented in MATLAB\\/SIMULINK environment. A Polymer Electrolyte Membrane (PEM) FC is used in this work. The FC model characteristics are selected

L. M. Fernandez; C. A. Garcia; P. Garcia; J. P. Torreglosa; F. Jurado



9th transgenic technology meeting (TT2010) in Berlin, Germany: a meeting report  

Microsoft Academic Search

The first Transgenic Technology (TT) Meeting was organized in 1999 by Johannes Wilbertz, Karolinska Institute, Stockholm,\\u000a Sweden as a regional meeting. The TT Meetings continued in this way, constantly gathering additional practitioners of transgenic\\u000a methodologies until the breakthrough in 2005 when the 6th TT Meeting in Barcelona, Spain, hosted by Lluis Montoliu (Centro\\u000a Nacional de Biotecnologia, Madrid, Spain), generated the

Thomas L. SaundersPeter Sobieszczuk; Peter Sobieszczuk



Phakic posterior chamber intraocular lens for high myopia  

Microsoft Academic Search

Purpose: To evaluate the efficacy, predictability, stability, and safety of the surgical correction of high myopia using a phakic posterior chamber intraocular lens (PPC IOL).Setting: Centro Oftalmológico de Valencia-CEOVAL, Valencia, Venezuela.Methods: A retrospective study was performed to analyze 18 eyes of 12 patients who had implantation of a modified PPC IOL, the implantable contact lens (ICL), for the treatment of

Angel Pineda-Fernández; Jorge Jaramillo; José Vargas; Miguel Jaramillo; José Jaramillo; Alicia Gal??ndez



Low temperature Grüneisen parameter of cubic ionic crystals  

NASA Astrophysics Data System (ADS)

Title of program: CAROLINA Catalogue number: AATG Program obtainable from: CPC Program Library, Queen's University of Belfast, N. Ireland (see application form in this issue) Computer: IBM/370, Model 158; Installation: Centro de Tecnología y Ciencia de Sistemas, Universidad de Buenos Aires Operating system: VM/370 Programming language used: FORTRAN High speed storage required: 3 kwords No. of bits in a word: 32 Peripherals used: disk IBM 3340/70 MB No. of lines in combined program and test deck: 447

Batana, Alicia; Monard, María C.; Rosario Soriano, María



The siting of a research centre on clean coal combustion and CO2 capture in Spain: Some notes on the relationship between trust and lack of public information  

Microsoft Academic Search

This paper aims to gain a better understanding of the role played by trust in the context of scarcity of public information, vis?à?vis the installation of a Centre for Investigation in Advanced Technologies (Centro de Investigación de Tecnologías Avanzadas, CITA) to be located in a coal?rich region of Spain. Data from semi?structured interviews (n = 15), a questionnaire survey (n = 400) and focus

Ana Prades; Josep Espluga; Marta Real; Rosario Solá



An integrated accelerator mass spectrometry radiocarbon dating and ion beam analysis approach for the study of archaeological contexts  

Microsoft Academic Search

The integration in the accelerator-based facility at CEDAD (Centro di Datazione e Diagnostica), University of Lecce, of a state-of-the art AMS (accelerator mass spectrometry) 14C dating system, and three different beam lines for IBA (ion beam analysis) compositional investigations, has given the possibility of developing an integrated IBA-AMS approach to the study of a wide range of archaeological problems. Here

G. Quarta; M. D’Elia; K. Butalag; L. Maruccio; G. Demortier; L. Calcagnile



Frequency of supernumerary teeth in Mexican population.  


Supernumerary teeth (ST) are a not uncommon developmental anomaly which appears in 0.3 to 3.8 percent of the population. We studied the corresponding radiographs from 2241 patients, both sexes who seeked dental attention at the Outpatient Clinic of the División de Estudios de Posgrado e Investigación, Facultad de Odontología, UNAM in Mexico City. Of them, we found 72 patients (3.2%) with 102 ST. Of the 72 patients, 39 were males (54.2%) and 33 females (45.8%). Mesiodens was the most common ST (48.6%), followed by supernumerary premolars (26.4%), supernumerary laterals (11.1%) and fourth molars (9.7%). This series includes cases with one, two and three ST and one case comprising 10 ST. Our results suggest that frequency of ST in the population studied differs in some aspects with previously reported series and that frequency of ST shows different rates depending the population studied. As our results demonstrate, it is encouraged the need to have panoramic radiographs of all patients attended in dental offices, clinics and schools of Dentistry in order to detect and diagnose undiscovered pathologies. PMID:15580117

Salcido-García, Juan Francisco; Ledesma-Montes, Constantino; Hernández-Flores, Florentino; Pérez, Diego; Garcés-Ortíz, Maricela


[Ovarian activity of Agouti paca (Rodentia: Agoutidae) under captivity].  


The ovarian activity of Agouti paca was characterized by hormonal profiles and ovarian structures. Samples of blood were taken from eight females (seven adults and one juvenile) at the breeding grounds of the Facultad de Medicina Veterinaria y Zootecnia in Yucat?n, Mexico. Sampling lasted approximately two months and was done every three and six days. Blood was collected from anesthetized animals, and the levels of progesterone (P4) and 17 beta estradiol (E2) were analized by radioimmunoassay technique. Macroscopic and microscopic analyses were carried out in ovaries of dead animals. The estrous cycle lasted 29+/-8.4 days, levels of 1.61+/-0.65 ng/ml for P4 and 39+/-24 pg/ml for E2 were observed for a follicular phase, 6.18+/-3.70 ng/ml and 29+/-16 pg/ml for P4 and E2 respectively in the luteal phase. Statistically significant differences were found between phases for P4 but not for E2. The presence of extragonadal steroids with levels of P4 of 1.9+/-0.77 ng/ml and E2 of 22+/-17 pg/ml were observed, which are not produced by the effects of managing stress. The changes in the levels of P4 during the cycle are indicators of luteal activity, with the intersticial tissue acting probably as active steroids-producing gland. Follicular growth was observed during the entire cycle. PMID:18491631

Montes Pérez, Rubén C; Cabrera Baz, Elsy A



Effect of cadmium on cellular viability in two species of microalgae (Scenedesmus sp. and Dunaliella viridis).  


We determined the effect of several concentrations of cadmium (0, 5, 10, and 20 microg/l) on cellular viability in the microalgae Scenedesmus sp. and Dunaliella viridis, by measuring growth at 0, 24, 48, 72, and 96 h and pigment production at 10 days. Algae were obtained from the Nonvascular Plant Laboratory collection, in the Facultad Experimental de Ciencias, Universidad del Zulia, Venezuela. Growth was measured by cellular counting, while pigment content was evaluated using conventional spectrophotometric techniques. Growth of both species decreased in the exposed cultures comparing with the control, but its behavior was similar, because in both control and exposed cultures, its was observed an adaptive phase in the first hours, as well as a growth phase after 72 h. Cadmium concentrations above 10 microg/l produced an adverse effect on pigment production, depending on the concentration and/or exhibition time. However, even though cadmium inhibited growth and pigment production, levels of both parameters indicated cellular viability, demonstrating the adaptability of the algae cultures when they were exposed to the metal. PMID:19172231

Marcano, Letty Beatriz C; Carruyo, Ingrid M; Montiel, Xiomara M; Morales, Carolina B; de Soto, Patricia Moreno



[Toxic fungi in Buenos Aires City and surroundings].  


In Facultad de Ciencias Exactas y Naturales,Universidad de Buenos Aires there is a service called Servicio de Identificación de Hongos Tóxicos, directed by researchers of the Program of Medicinal Plants and Fungi Involved in Biological Degradation (PROPLAME-PRHIDEB, CONICET) that assist hospitals and other health establishments, identifying the different samples of fungi and providing information about their toxicity, so that patients can receive the correct treatment. The objective of the present study was to analyze all the cases received from 1985 to 2012. This analysis permitted the confection of a table identifying the most common toxic species. The information gathered revealed that 47% of the patients were under 18 years of age and had eaten basidiomes; the remaining 53% were adults who insisted that they were able to distinguish edible from toxic mushrooms. Chlorophyllum molybdites turned out to be the main cause of fungal intoxication in Buenos Aires, which is commonly confused with Macrolepiota procera, an edible mushroom. In the second place Amanita phalloides was registered, an agaric known to cause severe symptoms after a long period of latency (6-10 hours), and which can lead to hepatic failure even requiring a transplant to prevent severe internal injuries or even death, is not early and correctly treated. PMID:24152394

Romano, Gonzalo M; Iannone, Leopoldo; Novas, María V; Carmarán, Cecilia; Romero, Andrea I; López, Silvia E; Lechner, Bernardo E



Commissioning Instrument for the GTC  

NASA Astrophysics Data System (ADS)

During the GTC integration phase, the Commissioning Instrument (CI) will be a diagnostic tool for performance verification. The CI features four operation modes: imaging, pupil imaging, Curvature WFS, and high resolution Shack-Hartmann WFS. This instrument was built by the Instituto de Astronomía UNAM and the Centro de Ingeniería y Desarrollo Industrial (CIDESI) under GRANTECAN contract after a public bid. In this paper we made a general instrument overview and we show some of the performance final results obtained when the Factory Acceptance tests previous to its transport to La Palma.

Cuevas, S.; Sánchez, B.; Bringas, V.; Espejo, C.; Flores, R.; Chapa, O.; Lara, G.; Chavolla, A.; Anguiano, G.; Arciniega, S.; Dorantes, A.; González, J. L.; Montoya, J. M.; Toral, R.; Hernández, H.; Nava, R.; Devaney, N.; Castro, J.; Cavaller-Marqués, L.



The GTC Scientific Data Archive  

NASA Astrophysics Data System (ADS)

The GTC Archive is the result of a collaboration agreement between INTA and GRANTECAN. It has been developed in the framework of the Spanish Virtual Observatory project and is maintained by the Data Archive Unit of the Centro de Astrobiología (INTA-CSIC). The archive has been designed in compliance with the standards defined by the International Virtual Observatory Alliance which will guarantee the high levels of data accessibility and handling demanded by a telescope of the significance of GTC. In this paper we describe the main characteristics and functionalities of the GTC Scientific Archive.

Solano, E.; Gutiérrez, E.



The Gran Telescopio Canarias and Calar Alto public archives  

NASA Astrophysics Data System (ADS)

In this paper we describe the main characteristics and functionalities of the Gran Telescopio Canarias (GTC) and Calar Alto public archives. The archives have been developed in the framework of the Spanish Virtual Observatory and are maintained by the Data Archive Unit at Centro de Astrobiología (CAB, INTA-CSIC). The archives contain both raw and science ready data and have been designed in compliance with the standards defined by the International Virtual Observatory Alliance (IVOA) which guarantees a high level of data accessibility and handling.

Solano, E.; Gutiérrez, R.; Alacid, J. M.; Jiménez-Esteban, F.; Velasco, A.



Low-Frequency Repetitive Transcranial Magnetic Stimulation (rTMS) Affects Event-Related Potential Measures of Novelty Processing in Autism  

Microsoft Academic Search

In our previous study on individuals with autism spectrum disorder (ASD) (Sokhadze et al., Appl Psychophysiol Biofeedback\\u000a 34:37–51, 2009a) we reported abnormalities in the attention-orienting frontal event-related potentials (ERP) and the sustained-attention\\u000a centro-parietal ERPs in a visual oddball experiment. These results suggest that individuals with autism over-process information\\u000a needed for the successful differentiation of target and novel stimuli. In the

Estate Sokhadze; Joshua Baruth; Allan Tasman; Mehreen Mansoor; Rajesh Ramaswamy; Lonnie Sears; Grace Mathai; Ayman El-Baz; Manuel F. Casanova



El número de supervivientes de cáncer en Estados Unidos asciende a aproximadamente 12 millones

El número de supervivientes de cáncer en Estados Unidos ascendió a 11,7 millones en 2007, de acuerdo a un informe publicado por los Centros para el Control y la Prevención de Enfermedades, CDC, y el Instituto Nacional del Cáncer, NCI, el cual forma parte de los Institutos Nacionales de la Salud. Hubo 3 millones de supervivientes de cáncer en 1971 y 9,8 millones en 2001.


Pregnancy after Bariatric Surgery: 39 Pregnancies Follow-up in a Multidisciplinary Team  

Microsoft Academic Search

Background  We investigate the outcomes of pregnancy in women who undergone restrictive–malabsorptive procedure at Centro da Obesidade\\u000a Mórbida–Hospital São Lucas (COM HSL-PUCRS), Porto Alegre, Brazil.\\u000a \\u000a \\u000a \\u000a \\u000a Methods  All pregnancies started after the bariatric surgery and with estimated due date until June 2008 were eligible for the study.\\u000a Only the first pregnancy of each patient was included in the data analysis. Data was collected

Flavia Emilia Bebber; Jacqueline Rizzolli; Daniela Schaan Casagrande; Marcelo Tadday Rodrigues; Alexandre Vontobel Padoin; Claudio Corá Mottin; Giuseppe Repetto


Current performance of the CAB robotic telescope: the road to high precision photometry  

NASA Astrophysics Data System (ADS)

The final limits of the photometric precision that may be achieved with a robotic telescope will depend upon the detection and control of all possible error sources. This involves efforts in mainly three related domains: instrumentation technology, calibration and data treatment. Here we will focus on the optimization of procedures for the automatic reduction of data taken with the 50-cm robotic telescope that is remotely operated at Centro de Astrobiología. The adopted strategies and the photometric precision achieved at different stages of the development of the project will be discussed, highlighting some of the main factors involved in past and future improvements.

Eibe, M. T.; Cuesta, L.; Ullán, A.; Pérez-Verde, A.; Navas, J.


Radiobiological compensation: A case study of uterine cervix cancer with concurrent chemotherapy  

SciTech Connect

The case of a patient diagnosed with uterine cervix cancer is presented as an example of the clinical application of the radiobiological compensation method implemented at Centro Estatal de Cancerologia de Durango. Radiotherapy treatment was initially modified to compensate for the chemotherapy component and, as medical complications arose during treatment delivery resulting in an 18 days gap, new compensation followed. All physical and radiobiological assumptions to calculate the Biologically Effective Dose in the external beam and brachytherapy parts of the treatment are presented. Good local control of the tumor was achieved, the theoretical tolerance limits for the organs at risk were not surpassed and the patient manifested no extensive morbidity.

Herrera, Higmar; Yanez, Elvia; Lopez, Jesus [Centro Estatal de Cancerologia de Durango, Victoria de Durango, Durango (Mexico); ISSSTE General Hospital Dr. Santiago Ramon y Cajal, Victoria de Durango, Durango (Mexico)



Radiobiological compensation: A case study of uterine cervix cancer with concurrent chemotherapy  

NASA Astrophysics Data System (ADS)

The case of a patient diagnosed with uterine cervix cancer is presented as an example of the clinical application of the radiobiological compensation method implemented at Centro Estatal de Cancerología de Durango. Radiotherapy treatment was initially modified to compensate for the chemotherapy component and, as medical complications arose during treatment delivery resulting in an 18 days gap, new compensation followed. All physical and radiobiological assumptions to calculate the Biologically Effective Dose in the external beam and brachytherapy parts of the treatment are presented. Good local control of the tumor was achieved, the theoretical tolerance limits for the organs at risk were not surpassed and the patient manifested no extensive morbidity.

Herrera, Higmar; Yañez, Elvia; López, Jesús



[Revealing a history of exclusion: the experience at Hospital-Colônia Itapuã Data and Research center].  


Inaugurated in May 1940, in Viamão Municipality in Rio Grande do Sul, Hospital Colônia Itapuã was meant to shelter Hansen's disease patients. Built in order to work as a small town, the hospital was the stage of several life and work histories. The fragments of these collective and individual experiences have been recovered since 1999, when Centro de Documentação e Pesquisa (Cedope/HCI) was first implemented. It is through the center activities that we propose a comparative study of the history of the hospital and the history of those who lived and those who still live in it. PMID:14650425

Fontoura, Arselle de Andrade da; Barcelos, Artur H F; Trindade Borges, Viviane



Statistical Analysis of Random Number Generators  

NASA Astrophysics Data System (ADS)

In many applications, for example cryptography and Monte Carlo simulation, there is need for random numbers. Any procedure, algorithm or device which is intended to produce such is called a random number generator (RNG). What makes a good RNG? This paper gives an overview on empirical testing of the statistical properties of the sequences produced by RNGs and special software packages designed for that purpose. We also present the results of applying a particular test suite--TestU01-- to a family of RNGs currently being developed at the Centro Interdipartimentale Vito Volterra (CIVV), Roma, Italy.

Accardi, Luigi; Gäbler, Markus



Cómo evaluar la información de cáncer disponible en Internet

Si usted o un familiar recibe un diagnóstico de cáncer es probable que busque información sobre la enfermedad. O quizás usted tenga interés en las formas de prevenir el cáncer o quiera obtener información sobre cómo un cáncer determinado afecta a la comunidad hispana. Hoy en día, Internet se usa cada vez más como una fuente para todo tipo de información, incluyendo información de cáncer. Un estudio reciente llevado a cabo por el centro de investigación Pew Research Center muestra que 80% de los usuarios de Internet, o 59% de los adultos de EE. UU., buscan información sobre la salud en Internet.


Status of TJ-II project  

SciTech Connect

The flexible Heliac TJ-II is a medium six device (R=1.5m, [a]=0.2 m, B(0)=1.0 T) in an advanced stage of construction at Centro de Investigaciones Energeticas Medio Ambientales y Tecnologicas (CIEMAT), Madrid. The problems encountered during manufacturing so far have been solved satisfactorily. Nevertheless the narrow tolerances, which result from the compact machine design, create real challenges for all the component manufacturers. In this paper we present the present status of the project with a particular emphasis on the construction situation of the main components. 1 ref., 2 figs., 1 tab.

Alejaldre, C.; Blaumoser, M.; Almoguera, L. [Asociacion EURATOM-CIEMAT para Fusion, Madrid (Spain)] [and others



Survey of strong motion earthquake effects on thermal power plants in California with emphasis on piping systems. Volume 2, Appendices  

SciTech Connect

Volume 2 of the ``Survey of Strong Motion Earthquake Effects on Thermal Power Plants in California with Emphasis on Piping Systems`` contains Appendices which detail the detail design and seismic response of several power plants subjected to strong motion earthquakes. The particular plants considered include the Ormond Beach, Long Beach and Seal Beach, Burbank, El Centro, Glendale, Humboldt Bay, Kem Valley, Pasadena and Valley power plants. Included is a typical power plant piping specification and photographs of typical power plant piping specification and photographs of typical piping and support installations for the plants surveyed. Detailed piping support spacing data are also included.

Stevenson, J.D. [Stevenson and Associates, Cleveland, OH (United States)



Bis(?-nitrito-?2 O:O)bis-[bis-(1-methyl-1H-imidazole-?N 3)(nitrito-?O)copper(II)  

PubMed Central

In the binuclear title compound, [Cu2(NO2)4(C4H6N2)4], centro­symmetric­ally related complex mol­ecules are linked via weak Cu—O inter­actions, forming dimeric units. The CuII atom displays an elongated square-pyramidal CuN2O3 coordination geometry with a slight tetra­hedral distortion of the basal plane [maximum deviation = 0.249?(2)?Å]. The dihedral angle formed by the imidazole rings is 26.20?(10)°.

Zhu, Run-Qiang



Development and application of tools for Monte Carlo based simulations in a particle beam radiotherapy facility.  


The integration of Monte Carlo (MC) transport codes into a particle therapy facility could be more easily achieved thanks to dedicated software tools. MC approach has been applied to several purposes at CNAO (Centro Nazionale di Adroterapia Oncologica), such as database generation for the treatment planning system, quality assurance calculations and biologically related simulations. In this paper we describe another application of the MC code and its tools by analyzing the impact of the dose delivery and range uncertainties on patient dose distributions. PMID:23352574

Tessonnier, T; Mairani, A; Cappucci, F; Mirandola, A; Vilches Freixas, G; Molinelli, S; Donetti, M; Ciocca, M



Bound states of the hydrogen atom in the presence of a magnetic monopole field and an Aharonov-Bohm potential  

NASA Astrophysics Data System (ADS)

In the present article we analyze the bound states of an electron in a Coulomb field when an Aharonov-Bohm field as well as a magnetic Dirac monopole are present. We solve, via separation of variables, the Schrödinger equation in spherical coordinates and we show how the hydrogen energy spectrum depends on the Aharonov-Bohm and the magnetic monopole strengths. The Klein-Gordon equation is also solved. Permanent address: Centro de Física, Instituto Venezolano de Investigaciones Científicas IVIC, Apartado 21827, Caracas 1020-A, Venezuela.

Villalba, Víctor M.



Análisis del futuro marco de referencia internacional  

NASA Astrophysics Data System (ADS)

La técnica de interferometría de muy larga línea de base (VLBI) se aplica hoy a la astrometría para el cálculo de posiciones precisas de radiofuentes extragalácticas. Por tratarse de objetos lejanos, sus movimientos propios aparentes pueden considerarse nulos; esta propiedad hace que los catálogos de radiofuentes extragalácticas VLBI constituyan la mejor materialización de un sistema de referencia celeste inercial definido cinemáticamente. La Unión Astronómica Internacional (IAU) recomendó la adopción de un nuevo sistema de referencia celeste internacional materializado por las coordenadas ecuatoriales de objetos extragalácticos observados con le técnica VLBI. Para superar la precisión astrométrica actual es necesaria una mejora en la modelización de aquellos fenómenos que pueden introducir desviaciones sistemáticas en el marco de referencia celeste. El objetivo de este trabajo es poner de manifiesto las sistematicidades presentes en los distintos marcos de referencia elaborados con el próposito de materializar el nuevo sistema de referencia celeste de la IAU. Para la comparación de los distintos marcos de referencia se propone un modelo de tres rotaciones diferenciales más un término lineal que procura absorber los efectos sistemáticos presentes en las coordenadas. Se analiza igualmente la estabilidad de la solución cuando se utilizan distintos conjuntos de objetos de definición.

Cionco, G. R.; Arias, E. F.


Sobre el estado evolutivo de ? Pictoris  

NASA Astrophysics Data System (ADS)

Desde el descubrimiento de fuertes excesos infrarrojos en ? Pictoris, esta estrella ha sido muy estudiada y es considerada candidata a poseer un sistema planetario propio. ? Pic está rodeada de un disco asimétrico de polvo que se observa de canto y que esta vacío a distancias <= 40 AU. Esto se considera una fuerte evidencia en favor de la presencia de (al menos) un planeta gigante. Recientemente se han observado líneas de material circunestelar que se han interpretado como consecuencia de la caída de objetos cometarios sobre esta estrella. Recientemente se ha utilizado la existencia del disco de polvo para atribuir una edad corta (pre - secuencia principal) a ?Pic. Sin embargo, la evaporación de estos cometas provee suficiente polvo como para explicar la presencia del disco observado sin necesidad de edades cortas. En este trabajo mostramos que la comparación entre la tasa de impactos cometarios estimada en el Sistema Solar para diferentes etapas de su evolución y los datos observados en ? Pic indica edades avanzadas para ? Pic. Esta estimación debe tomarse con cautela ya que depende de la estructura de los sistemas planetarios. Además mostramos que, desde el punto de vista de la evolución estelar y con las incertezas presentes en la luminosidad y la temperatura efectiva, existe un continuo de edades posible para ? Pic. Sin embargo, empleando los datos provenientes de los flujos cometarios encontramos que una edad prolongada es consistente con ambos tratamientos.

Brunini, A.; Benvenuto, O. G.


South American regional ionospheric maps computed by GESA: A pilot service in the framework of SIRGAS  

NASA Astrophysics Data System (ADS)

SIRGAS (Geocentric Reference Frame for the Americas) is an international enterprise of the geodetic community that aims to realize the Terrestrial Reference Frame in the America's countries. In order to fulfill this commitment, SIRGAS manages a network of continuously operational GNSS receivers totalling around one hundred sites in the Caribbean, Central, and South American region. Although the network was not planed for ionospheric studies, its potential to be used for such a purpose was recently recognized and SIRGAS started a pilot experiment devoted to establish a regular service for computing and releasing regional vertical TEC (vTEC) maps based on GNSS data. Since July, 2005, the GESA (Geodesia Espacial y Aeronomía) laboratory belonging to the Facultad de Ciencias Astronómicas y Geofísicas of the Universidad Nacional de La Plata computes hourly maps of vertical Total Electron Content (vTEC) in the framework of the SIRGAS pilot experiment. These maps exploit all the GNSS data available in the South American region and are computed with the LPIM (La Plata Ionospheric Model). LPIM implements a de-biasing procedure that improves data calibration in relation to other procedures commonly used for such purposes. After calibration, slant TEC measurements are converted to vertical and mapped using local-time and modip latitude. The use of modip latitude smoothed the spatial variability of vTEC, especially in the South American low latitude region and hence allows for a better vTEC interpolation. This contribution summarizes the results obtained by GESA in the framework of the SIRGAS pilot experiment.

Brunini, C.; Meza, A.; Gende, M.; Azpilicueta, F.



Remontant erosion in desert soils of Tamaulipas, México.  

NASA Astrophysics Data System (ADS)

REMONTANT EROSION IN DESERT SOILS OF TAMAULIPAS MÉXICO Rivera-Ortiz, P.1; Andrade-Limas, E.1; De la Garza-Requena, F.1 and Castro-Meza, B.1 1Facultad de Ingeniería y Ciencias, Universidad Autónoma de Tamaulipas, México The degradation of soil reduces the capacity of soils to produce food and sustain life. Erosion is one of the main types of soil degradation. Hydric erosion of remontant type can occur in soils located close to the channel of a river through the expansion of a gully that begins as a fluvial incision over the ravine of one side of the river. The incision takes place at the point of greatest flow of runoff from areas adjacent to empty into the river. The depth of the incision causes the growth of the gully by collapse to move their heads back, upstream. The soil loss by remontant erosion on land use in agriculture and livestock was estimated in order to understand the evolution of gullies formed by this type of erosion. Through measurements on satellite images and GPS (Global Positioning System) two gullies, developed on alluvial soils which drain into the river Chihue, were studied. The investigation was conducted during 2003 to 2010 period in the municipality of Jaumave, Tamaulipas, in northeastern Mexico. Soil loss in gullies developed by remontant erosion was large and it was caused by soil collapse and drag of soil on the headers. The estimated loss of soil by remontant erosion was 3500 t in the deeper gully during 2010 and nearly 1200 t per year in the period 2003-2009. New sections of gully of about 20 m length, with more than 3 m deep and up to 13 m wide, were formed each year. This degradation has significantly reduced the productive surface of soil that for many years has been used to the cultivation of maize (Zea mays) and beans (Phaseolus vulgaris) as well as pasture production.

Rivera-Ortiz, P.; Andrade-Limas, E.; De la Garza-Requena, F.; Castro-Meza, B.



Homeostatic control of slow-wave and spindle frequency activity during human sleep: effect of differential sleep pressure and brain topography.  


The impact of a 40 h sleep deprivation versus a 40 h multiple nap paradigm on topographic and temporal aspects of electroencephalographic (EEG) activity during the subsequent recovery sleep was investigated in 10 young volunteers in a controlled 'constant posture' protocol. The accumulation of sleep pressure with extended wakefulness could be significantly attenuated by intermittent naps. The differential sleep pressure conditions induced frequency- and topographic-specific changes in the EEG slow wave range (0.5-5 Hz) and in the low (LSFA, 12.25-13.25 Hz) and high spindle frequency activity range (HSFA, 13.75-16.5 Hz) during non-REM sleep. The observed increase of EEG slow-wave activity (SWA) after high sleep pressure was significantly more pronounced in the fronto-central (Fz, Cz) than in the parieto-occipital (Pz, Oz) derivations. Low sleep pressure after the nap paradigm decreased SWA with an occipital predominance. Spindle frequency activity showed a dissimilar homeostatic regulation: HSFA was significantly decreased after high sleep pressure and increased after low sleep pressure, exclusively in the centro-parietal brain region (Cz, Pz). LSFA was significantly enhanced after both manipulations. The data indicate that EEG activity, in particular frontal SWA and centro-parietal HSFA, are under a clear sleep-wake-dependent homeostatic control and imply a reciprocal relationship in the homeostatic regulation of SWA and HSFA, which however shows different spatio-temporal aspects. PMID:12217973

Knoblauch, V; Kräuchi, K; Renz, C; Wirz-Justice, A; Cajochen, C



An Environmental Watch System for the Andean Countries: El Observatorio Andino  

NASA Astrophysics Data System (ADS)

An experimental Environmental Watch System, the so-called Observatorio Andino-OA (Observatorio Andino), has been implemented in Venezuela, Colombia, Ecuador, Peru, Bolivia, and Chile over the past two years. The OA is a collaborative and regional network that aims to monitor several environmental variables and develop accurate forecasts based on different scientific tools. Its overall goal is to improve risk assessments, set up Early Warning Systems, support decision-making processes, and provide easily- and intuitively-understandable spatial maps to end-users. The initiative works under the scientific and logistic coordination of the Centro de Modelado Cient\\'ifico (CMC) at Zulia University, Venezuela, and the Centro Internacional para la Investigaci\\'on del Fen\\'omeno 'El Ni\\~no' (CIIFEN), and is operated at a local level by the National Weather Services (NWSs) of the aforementioned six Andean nations. The OA provides several freely-available model outputs including meteorological and hydrological forecasts, droughts, fire and flood indices, ecosystems dynamics, climate and health applications, and five-day high-resolution oceanographic predictions for the Eastern Pacific. This article briefly describes the current products, methodologies and dynamical and statistical modeling outputs provided by the OA. Also, a discussion on how these sets of tools have been put together as a coordinated, scientific watch and forecast system for each country and for the entire region is presented. Our experiences over the past two years suggest that this initiative would significantly improve the current decision-making processes in Andean countries.

Muñoz, Ángel G.; López, Patricio; Velásquez, Ramón; Monterrey, Luis; León, Gloria; Ruiz, Franklyn; Recalde, Cristina; Cadena, Jaime; Mejía, Raúl; Paredes, Marcos; Bazo, Juan; Reyes, Carmen; Carrasco, Gualberto; Castellón, Yaruska; Villarroel, Claudia; Quintana, Juan; Urdaneta, Avel



Effect of a magnetic field on the vibrations of an ionic lattice  

SciTech Connect

If an ionic solid is regarded as a vibrating lattice of point charges, a static magnetic field will exert a Lorentz force on each ion. In this paper the standard lattice dynamical theory is modified to allow for such forces, and a perturbation approach is developed. The frequencies of lattice vibrations and the velocity of propagation of acoustic waves are found to be perturbed, with the perturbation parameter being the ratio of the ion-cyclotron frequency in the magnetic field to the characteristic frequency of lattice vibrations. It is found that in non-centro-symmetric crystals the perturbation will be first order in this parameter (and hence in the magnetic field), while for centro-symmetric crystals, with certain exceptions, they will be second order. The exceptions are for degenerate modes, such as <100> and <110> propagation in cubic crystals, when a first-order effect which is quadratic in the wave number is predicted. The possibility of experimental measurements of the first-order effects is pointed out. A simple two-dimensional model is examined for more detailed illustration.

Vineyard, G.H.



Bases para la elaboracion de unidades didacticas de calidad en el area de ciencias (Fisica y Quimica 3 deg ESO)  

NASA Astrophysics Data System (ADS)

Este Trabajo Fin de Master tiene como objeto, el estudio previo de la educacion de la ciencia en la actualidad y mas destacable, del diseno de las unidades didacticas segun las metodologias mas frecuentes aplicadas por los diferentes sistemas educativos en el area de las Ciencias teniendo en cuenta la importancia y el efecto de la psicologia del alumnado y todo ello como no puede ser de otro modo bajo el corse de la Legislacion aplicable, Estatal, Autonomica y europea. Con estos antecedentes, se extrae cuales son las preguntas que deben contestarse en la elaboracion de una unidad didactica de calidad en el contexto, generacional (edad y sexo), del Proyecto Educativo de Centro, y de la Programacion del Departamento, discutiendo y justificando cada uno de los apartados en que estructuradamente dividiremos dicha Unidad, con un formato manejable, util, y dinamico en el tiempo que sea un verdadero instrumento educativo de aula. Teniendo en cuenta estas premisas, se procede a hacer una recopilacion de una misma unidad didactica publicada por diferentes editoriales, elegidas no al azar, sino en funcion de su penetracion editorial en nuestros centros de ESO, siendo las elegidas (SM y Oxford). Las diferentes unidades seleccionadas son analizadas de forma critica, atendiendo a los criterios generales de calidad bajo parametros cientificos y normativos, concluyendo con la aportacion final que es la redaccion de unas pautas cientifico-pedagogicas, para redactar unidades didacticas de calidad en el area de la Ciencias, en concreto en la Asignatura de Fisica y Quimica de 3º de ESO.

Maccioni, Elena Lucia


Tool perception suppresses 10-12Hz ? rhythm of EEG over the somatosensory area.  


The perception of tools vs. other objects has been shown to activate the premotor (BA6) and somatosensory cortex (BA3), which neurally represent object affordance related to tool manipulability (Proverbio et al., 2011). The earliest tool/non-tool discrimination is represented by increased anterior negativity (210-270ms) in response to tools. In this study, we analyzed ? desynchronization with wavelet analysis based on EEG recordings in response to 300 familiar objects vs. tools in 11 participants. The results showed an early 140-175ms ? desynchronization over centro-parietal sites at approximately 10-12Hz during tool perception. The surface scalp distribution of ? power is compatible with neural generators located in the somatosensory cortex, but no source analysis was performed. These results support the hypothesis that there is a temporal and functional relationship between the rapid and transient ? suppression over the centro/parietal area and the successive increase in time-locked post-synaptic potentials (ERPs) in regions processing tool motor affordance. PMID:22543070

Proverbio, Alice Mado



[Fungi microbiot of Melipona subnitida Ducke (Hymenoptera: Apidae)].  


This paper reports on the occurrence of filamentous fungi found on the surface of the bees body from the specie Melipona subnitida Ducke that inhabits rocky places on the semi-arid Northeastern Brazil. Bees with cause of natural death were collected of beehives belonging to the Centro de Multiplicação de Animais Silvestres of the Universidade Federal Rural do Semi-Arido. We found the fungi: Aspergillus sp. 6 (37.5%); Aspergillus niger 2 (12.5%); Penicilium sp. 2 (12.5%); Aspergillus terreus 1 (6.3%); Curvularia sp. 1 (6.35%); Monilia sp. 1 (6.3%); Nigrospora sp. 1 (6.3%); Cladosporium sp. 1 (6.3%); Tricoderma sp. 1 (6.3%). PMID:18641909

Ferraz, Richard E; Feijó, Francisco M C; Alves, Nilza D; Lima, Paulo M; Pereira, Daniel S; Freitas, Carlos C O


Damage potential characteristics of near-field earthquake motions  

SciTech Connect

In recent major earthquakes; i.e., 1994 Northridge earthquake in the US and 1995 Great Kansai earthquake in Japan, several close-distance strong ground motions have been obtained, which may be of significant interest to earthquake/structural engineers. The damage potential of those recently obtained ground motions is examined based on the nonlinear response analyses of various SDOF systems. For comparison purposes, the El Centro records from the 1940 Imperial Valley earthquake, as well as a set of artificial motions consistent with the R.G. 1.60 spectrum were also used. The engineering insights regarding the seismic design of structures are discussed based on a series of parametric studies.

Park, Y. [Brookhaven National Lab., Upton, NY (United States); Chokshi, N. [Nuclear Regulatory Commission, Washington, DC (United States)



A High Resolution Phoswich Detector: LaBr3(Ce) Coupled With LaCl3(Ce)  

NASA Astrophysics Data System (ADS)

An innovative solution for the forward end-cap CALIFA calorimeter of R3B is under investigation consisting of two scintillation crystals, LaBr3 and LaCl3, stacked together in a phoswich configuration with one readout only. This dispositive should be capable of a good determination of the energy of protons and gamma radiation. This composite detector allows to deduce the initial energy of charged particles by ?E1+?E2 identification. For gammas, the simulations show that there is a high probability that the first interaction occurs inside the scintillator at few centimeters, with a second layer, the rest of the energy is absorbed, or it can be used as veto event in case of no deposition in the first layer. One such a detector has been tested at the Centro de MicroAnálisis de Materiales (CMAM) in Madrid. Good resolution and time signal separation have been achieved.

Carmona-Gallardo, M.; Borge, M. J. G.; Briz, J. A.; Gugliermina, V.; Perea, A.; Tengblad, O.; Turrión, M.



The development of the VSB-30 sounding rocket vehicle  

NASA Astrophysics Data System (ADS)

The genesis of the VSB-30 lies in the SONDA III vehicle, which had its first flight in 1976. In 1996, DLR proposed to Centro Técnico Aerospacial (CTA) the adaptation of its Mini-TEXUS payload to the first stage of SONDA III. This new single stage vehicle is known as VS-30. In 2001, the Unified Microgravity Program for Sounding Rockets proposed to CTA the development of a boosted version of the VS-30. The challenge was accepted and the development of the S31 booster motor started. This work presents the technical aspects of the development of the S31 motor and of the new VSB-30 vehicle. The qualification of the motor will consist of three static firings. The maiden flight is plannned for the beginning of 2004 in Alcântara. The first operational flight from Kiruna is scheduled for the second semester of 2005.

Palmerio, Ariovaldo Felix; Peres da Silva, José Pedro Claro; Turner, Peter; Jung, Wolfgang



New brown dwarf companions to dM(e) stars  

NASA Astrophysics Data System (ADS)

We present new astrometric and spectroscopic data to confirm two new M/L dwarf systems, G124-62 and LHS5166, and discuss the nature of a third system (LP261-75). Age and thus mass determinations of the L dwarf companions are discussed based on various activity-age relationships of the M dwarf primaries. This publication will update the list of widely separated substellar companions to nearby stars. This paper is partly based on observations obtained at the European Southern Observatory at La Silla, Chile under program ID 072.C-0571(B) and on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC).

Seifahrt, A.; Mugrauer, M.; Wiese, M.; Neuhäuser, R.; Guenther, E. W.



Astronomía en la cultura  

NASA Astrophysics Data System (ADS)

La Astronomía en la Cultura es el estudio interdisciplinario a nivel global de la astronomía prehistórica, antigua y tradicional, en el marco de su contexto cultural. Esta disciplina abarca cualquier tipo de estudios o líneas de investigación en que se relacione a la astronomía con las ciencias humanas o sociales. En ella se incluyen tanto fuentes escritas, relatos orales como fuentes arqueológicas, abarcando entre otros, los siguientes temas: calendarios, observación práctica, cultos y mitos, representación simbólica de eventos, conceptos y objetos astronómicos, orientación astronómica de tumbas, templos, santuarios y centros urbanos, cosmología tradicional y la aplicación ceremonial de tradiciones astronómicas, la propia historia de la astronomía y la etnoastronomía (Krupp, 1989) (Iwaniszewski, 1994). En nuestro trabajo abordamos la historia y situación actual de esta disciplina, sus métodos y sus relaciones con otras áreas de investigación.

López, A.; Giménez Benitez, S.; Fernández, L.


Selective mutism and abnormal electroencephalography (EEG) tracings.  


Epileptic discharges are not considered a part of the clinical picture of selective mutism, and electroencephalography is generally not recommended in its work-up. This report describes 6 children with selective mutism who were found to have a history of epilepsy and abnormal interictal or subclinical electroencephalography recordings. Two of them had benign epilepsy of childhood with centro-temporal spikes. The mutism was not related in time to the presence of active seizures. While seizures could be controlled in all children by medications, the mutism resolved only in 1. Although the discharges could be coincidental, they might represent a co-morbidity of selective mutism or even play a role in its pathogenesis. Selective mutism should be listed among the psychiatric disorders that may be associated with electroencephalographic abnormalities. It can probably be regarded as a symptom of a more complicated organic brain disorder. PMID:21596703

Politi, Keren; Kivity, Sara; Goldberg-Stern, Hadassa; Halevi, Ayelet; Shuper, Avinoam



Silver surface enrichment in ancient coins studied by micro-PIXE  

NASA Astrophysics Data System (ADS)

The surface enrichment of archeological silver-copper alloys, either intentional or due to corrosion processes, has been known for many years. The most used non-destructive techniques, such as particle-induced X-ray emission (PIXE) and X-ray fluorescence (XRF) are surface techniques, with penetration depths typically ranging from a few microns to a few tens of microns. Therefore, these techniques could produce results which are not representative of the bulk composition of the alloy.In order to gain insight into the silver enrichment process and the effects on the data obtained with these techniques, a set of silver roman denarii were cross sectioned and analyzed at the Centro Nacional de Aceleradores micro-PIXE facility. Elemental maps show silver surface enriched layers up to 250 ?m thick. Besides, silver-enriched surface layers are not found for alloys with 96-98 wt.% Ag.

Ager, F. J.; Moreno-Suárez, A. I.; Scrivano, S.; Ortega-Feliu, I.; Gómez-Tubío, B.; Respaldiza, M. A.



Differential-ground-motion array at Hollister Municipal Airport, California  

SciTech Connect

This report describes the differential array of seismometers recently installed at the Hollister, California, Municipal Airport. Such an array of relatively closely spaced seismometers has already been installed in El Centro and provided useful information for both engineering and seismological applications from the 1979 Imperial Valley earthquake. Differential ground motions, principally due to horizontally propagating surface waves, are important in determining the stresses in such extended structures as large mat foundations for nuclear power stations, dams, bridges and pipelines. Further, analyses of the records of the 1979 Imperial Valley earthquake from the differential array have demonstrated the utility of short-baseline array data in tracking the progress of the rupture wave front of an earthquake. 5 refs., 4 figs.

Bycroft, G.N.



Statistical Analysis of Sleep Spindle Occurrences  

PubMed Central

Spindles - a hallmark of stage II sleep - are a transient oscillatory phenomenon in the EEG believed to reflect thalamocortical activity contributing to unresponsiveness during sleep. Currently spindles are often classified into two classes: fast spindles, with a frequency of around 14 Hz, occurring in the centro-parietal region; and slow spindles, with a frequency of around 12 Hz, prevalent in the frontal region. Here we aim to establish whether the spindle generation process also exhibits spatial heterogeneity. Electroencephalographic recordings from 20 subjects were automatically scanned to detect spindles and the time occurrences of spindles were used for statistical analysis. Gamma distribution parameters were fit to each inter-spindle interval distribution, and a modified Wald-Wolfowitz lag-1 correlation test was applied. Results indicate that not all spindles are generated by the same statistical process, but this dissociation is not spindle-type specific. Although this dissociation is not topographically specific, a single generator for all spindle types appears unlikely.

Panas, Dagmara; Malinowska, Urszula; Piotrowski, Tadeusz; Zygierewicz, Jaroslaw; Suffczynski, Piotr



State-selective electron capture in He32+ + He collisions at intermediate impact energies  

NASA Astrophysics Data System (ADS)

In this work we have measured single-electron capture in collisions of He32+ projectiles incident on a helium target for energies of 13.3-100 keV/amu with the cold-target recoil-ion momentum spectroscopy setup implemented at the Centro Atómico Bariloche. State-selective single-capture cross sections were measured as a function of the impact energy. They were found to agree with previous existing data from the Frankfurt group, starting at the impact energy of 60 keV/amu; as well as with recent data, at 7.5 keV/amu, from the Lanzhou group. The present experimental results are also contrasted to the classical trajectory Monte Carlo method with dynamical screening.

Alessi, M.; Otranto, S.; Focke, P.



Discovery of an extended infrared reflection nebula around S106  

NASA Astrophysics Data System (ADS)

An extensive, low surface brightness reflection nebula has been discovered around S106 by mapping the infrared polarization at 2.2 ?m. Polarized flux is detected to almost 3 arcmin from the central source (IRS4), well beyond the main part of the optical H II nebula. The pattern of polarization vectors is centro-symmetric about the embedded object and is a characteristic of a reflection nebula. Polarizations as large as 25 per cent are observed, with the remarkable result that there is no obvious anomaly in the distribution of 2.2 ?m polarization corresponding to the optical bipolar morphology. This difference can be explained by a simple model involving a compact dust disc near the embedded star. The authors also discuss the implications of this detection as an important new tracer of the extent of dust, and for the significant role that scattering from grains may play in protostellar clouds and obscured bipolar flows.

McLean, I. S.; McCaughrean, M. J.; Gatley, I.; Hough, J.; Sato, S.; Nagata, T.; Axon, D.; Burton, M. G.; Garden, R.; Aspin, C.; Hasegawa, T.; Hayashi, M.; Morimoto, M.; Kaifu, N.



West Nile Virus in California  

PubMed Central

West Nile virus (WNV) was first isolated in California during July 2003 from a pool of Culex tarsalis collected near El Centro, Imperial County. WNV transmission then increased and spread in Imperial and Coachella Valleys, where it was tracked by isolation from pools of Cx. tarsalis, seroconversions in sentinel chickens, and seroprevalence in free-ranging birds. WNV then dispersed to the city of Riverside, Riverside County, and to the Whittier Dam area of Los Angeles County, where it was detected in dead birds and pools of Cx. pipiens quinquefasciatus. By October, WNV was detected in dead birds collected from riparian corridors in Los Angeles, west to Long Beach, and through inland valleys south from Riverside to San Diego County. WNV was reported concurrently from Arizona in mid-August and from Baja, Mexico, in mid-November. Possible mechanisms for virus introduction, amplification, and dispersal are discussed.

Lothrop, Hugh; Chiles, Robert; Madon, Minoo; Cossen, Cynthia; Woods, Leslie; Husted, Stan; Kramer, Vicki; Edman, John



A possible approach on optical analogues of gravitational attractors.  


In this paper we report on the feasibility of light confinement in orbital geodesics on stationary, planar, and centro-symmetric refractive index mappings. Constrained to fabrication and [meta]material limitations, the refractive index, n, has been bounded to the range: 0.8 ? n(r[combining arrow]) ? 3.5. Mappings are obtained through the inverse problem to the light geodesics equations, considering trappings by generalized orbit conditions defined a priori. Our simulation results show that the above mentioned refractive index distributions trap light in an open orbit manifold, both perennial and temporal, in regards to initial conditions. Moreover, due to their characteristics, these mappings could be advantageous to optical computing and telecommunications, for example, providing an on-demand time delay or optical memories. Furthermore, beyond their practical applications to photonics, these mappings set forth an attractive realm to construct a panoply of celestial mechanics analogies and experiments in the laboratory. PMID:23571920

San-Román-Alerigi, Damián P; Slimane, Ahmed B; Ng, Tien K; Alsunaidi, Mohammad; Ooi, Boon S



[Morphological characterization of annatto fruits 9bixa orellana L.) and its correspondence with protein and isoenzym patterns].  


A group of 32 annatto genotypes collected in five Venezuelan regions (Oriente, Centro, Llanos, Andes and Amazonas) and in Brazil were used for morphological studies. The fruit variables with the greatest discriminatory power in the formation of groups were capsule size, spinosity and seed size. On the other hand, an association group among the variables spinosity, spine length, dehiscence and apex shape were formed, also a proportional association between capsule and seed size, and between dehiscent capsule and brown coloured seeds. Additionally, in order to discriminate morphological variables behaviour in respond to electrophoretic variables, a group of protein and isozyme bands associated with fruit characteristics were established. Therefore, a classification system of this species was possible using morphological studies of the capsules, even though a determined association relating morphological and molecular patterns was not found. PMID:11510423

Medina, A M; Michelangeli, C; Ramis, C; Díaz, A



SAMOA Solar and Atmospheric Measurements and Observations Archive  

NASA Astrophysics Data System (ADS)

SAMOA is a grid portal developed at the INAF-OAR to share and analyze the solar and atmospheric data provided by the three institutes affiliated to the CVS - Centro per lo studio della Variabilità del Sole. At present, SAMOA includes about 1 TB of data from the geographically distributed archives and consists present and past full-disk solar observations at several spectral bands provided by the INAF-OAR, ionospheric and geomagnetic measurements obtained by the INGV and University of Rome 'Tor Vergata'. Data are all included in a unique virtual environment where several pre-analysis tools are also provided. Realized through open source web languages, SAMOA is an example of Service-Oriented-Architecture tool for virtual organizations devoted to share solar and atmospheric resources.

Perna, C.


A national neurological excellence centers network.  


The most relevant problems related to the management of neurological disorders are (i) the frequent hospitalization in nonspecialist departments, with the need for neurological consultation, and (ii) the frequent requests of GPs for highly specialized investigations that are very expensive and of little value in arriving at a correct diagnosis. In 1996, the Consorzio di Bioingegneria e Informatica Medica in Italy realized the CISNet project (in collaboration with the Consorzio Istituti Scientifici Neuroscienze e Tecnologie Biomediche and funded by the Centro Studi of the National Public Health Council) for the implementation of a national neurological excellence centers network (CISNet). In the CISNet project, neurologists will be able to give on-line interactive consultation and off-line consulting services identifying correct diagnostic/therapeutic procedures, evaluating the need for both examination in specialist centers and admission to specialized centers, and identifying the most appropriate ones. PMID:9533676

Pazzi, S; Cristiani, P; Cavallini, A



Avionic System for the CIRA USV Program  

NASA Astrophysics Data System (ADS)

This paper describes the Avionic System that TSDev has developed for the Centro Italiano Ricerche Aerospaziali (CIRA) Flight Test Bed (FTB) in the framework of the Italian Unmanned Space Vehicle (USV) program. The FTB Avionic System is composed by a number of units able to provide the vehicle with all the functionality required by an unmanned aerospace flight. The architecture of the avionics has been defined so to guarantee modularity, upgradeability, and high performances. Custom solutions for most of the required functionality have allowed to fulfil the very demanding requirements in terms of mass, power, and volume. Very interesting reliability levels have been obtained by properly selecting the components and adopting hot redundancy at least for the most critical functions.

Capuano, G.; Longobardi, P.; Cacace, F.; Richiello, C.; Di Donato, M. P.



Study of deformation and shape recovery of NiTi nanowires under torsion.  


The nanomechanical properties, deformation, and shape recovery mechanism of NiTi nanowires (NWs) under torsion are studied using molecular dynamics simulations. The effects of loading rate, aspect ratio of NWs, and NW shape are evaluated in terms of atomic trajectories, potential energy, torque required for deformation, stress, shear modulus, centro-symmetry parameter, and radial distribution function. Simulation results show that dislocation nucleation starts from the surface and then extends to the interior along the {110} close-packed plane. For a high loading rate, the occurrence of torsional buckling of a NW is faster, and the buckling gradually develops near the location of the applied external loading. The critical torsional angle and critical buckling angle increase with aspect ratio of the NWs. Square NWs have better mechanical strength than that of circular NWs due to the effect of shape. Shape recovery naturally occurs before buckling. PMID:23329144

Wu, Cheng-Da; Sung, Po-Hsien; Fang, Te-Hua



Seismic response of bridge piers on elasto-plastic Winkler foundation allowed to uplift  

NASA Astrophysics Data System (ADS)

When the bridge piers with shallow foundation are subject to intensive earthquake excitations, uplift of foundations will occur and the foundation soil will partly become plastic. It is very difficult to use an accurate method to simulate the uplifting and yielding of supporting soil. An improved Winkler foundation model, which could be used to consider the uplift and yield, was employed in the analysis. The 1940 El Centro earthquake record is inputted to a rigid pier with shallow foundation so that the non-linear history response is obtained. From the non-linear analysis, it is concluded that the non-linear effect is very remarkable when uplifting and yielding of supporting soil are considered. Compared with the linear analysis, the stiffness of bridge pier-soil system degrades in each cycle after considering uplifting and yielding. It is shown that the non-linear analysis can get larger rotational angles and smaller bending moments compared with the linear analysis.

Chen, Xing-Chong; Lai, Yuan-Ming



Evidencia de alta concentración de masa en la región nuclear de una galaxia liner  

NASA Astrophysics Data System (ADS)

Usando técnicas de espectroscopía bidimensional en el telescopio de 1.54 m de Bosque Alegre, se obtuvo el campo de velocidades de la región nuclear de NGC 1672, galaxia LINER con un anillo circumnuclear de regiones HII. La curva de rotación media para los 2 kpc centrales sugiere la presencia de una gran concentración de masa (?c~ 1011Msolar /kpc3). Este resultado es respaldado por la presencia de ciertos caracteres morfológicos detectados en imágenes obtenidas con el mencionado telescopio. Según recientes simulaciones hidrodinámicas de galaxias barreadas, estos caracteres sugieren la presencia de altas densidades en las regiones nucleares. El análisis espectrofotométrico indicaría, además, la presencia de dos componentes en la emisión nuclear, con una diferencia de velocidades de ~ 200 km/s. La velocidad circular del gas ionizado a 125 pc del centro señalaría la existencia de una masa interior de ~ 7× 108Msolar .

Díaz, R.; Carranza, G.; Dottori, H.; Goldes, G.


Growth, Structural And Optical Studies On Bis L-alanine Lithium Chloride (BLALC) Single Crystal  

NASA Astrophysics Data System (ADS)

Bis L-alanine Lithium Chloride (BLALC) single crystals were grown successfully by solution method with slow evaporation technique at room temperature. Crystals of size 15 x 9 x 4 mm3 have been obtained in 28 days. The grown crystals were colourless and transparent. Single crystal X-ray diffraction (XRD) study showed that BLALC belongs to orthorhombic system with a non-centro-symmetric space group P212121. The crystallinity of BLALC crystal was confirmed by the powder X-ray diffraction study and diffraction peaks were indexed. The functional groups of the grown crystals have been identified by FTIR studies. UV-visible transmittance spectrum was recorded to study the optical transparency of BLALC crystal. The nonlinear optical (NLO) property of the grown crystal was confirmed by Kurtz-Perry powder technique.

Rose, A. S. J. Lucia; Selvarajan, P.; Perumal, S.



Evaluation of a solar intermittent refrigeration system for ice production operating with ammonia/lithium nitrate  

SciTech Connect

A novel solar intermittent refrigeration system for ice production developed in the Centro de Investigacion en Energia of the Universidad Nacional Autonoma de Mexico is presented. The system operates with the ammonia/lithium nitrate mixture. The system developed has a nominal capacity of 8 kg of ice/day. It consists of a cylindrical parabolic collector acting as generator-absorber. Evaporator temperatures as low as -11 C were obtained for several hours with solar coefficients of performance up to 0.08. It was found that the coefficient of performance increases with the increment of solar radiation and the solution concentration. A dependency of the coefficient of performance was not founded against the cooling water temperature. Also it was found that the maximum operating pressure increases meanwhile the generation temperature decreases with an increase of the solution concentration. (author)

Rivera, W.; Moreno-Quintanar, G.; Best, R. [Centro de Investigacion en Energia, Universidad Nacional Autonoma de Mexico, A.P. 34, 62580 Temixco, Mor. (Mexico); Rivera, C.O.; Martinez, F. [Facultad de Ingenieria Campus Coatzacoalcos, Universidad Veracruzana, Av. Universidad Km 7.5, 96530 Coatzacoalcos, Ver. (Mexico)



A revised configuration of the southern California uplift  

USGS Publications Warehouse

Recently recovered archival levelling data from southwestern Arizona and adjacent parts of California compel major revisions in the configuration and interpretation of the southern California uplift, both at its culmination and following its partial collapse. Re-examination of the older vertical-control record indicates that similar modifications may be equally appropriate in any reconsideration of the early-20th-century analogue of the southern California uplift. The chief changes in our earlier reconstructions appear as a sharply diminished isobase gradient south of Cottonwood Pass, dramatically reduced tectonic subsidence centering on the Salton Sea, and short-lived uplift of of at least 0.3 m at the latitude of El Centro. A newly refined qualitative interpretation of the data implies contraction and decoupling at the base of the seismogenic zone, in conjunction with right-stepping movement and extension between an en echelon transform pair through the Salton Basin. -from Authors

Castle, R. O.; Gilmore, T. D.



Phosphorus in the environment  

NASA Astrophysics Data System (ADS)

IsoPhos 2012: Development of Isotopic Tracers for a Better Understandingof the Phosphorus Cycle;Monte Verità, Switzerland, 24-29 June 2012 IsoPhos 2012, a conference dedicated to cutting-edge research on phosphorus, was held in the Centro Stefano Franscini of the Swiss Federal Institute of Technology of Zurich (ETH Zurich). It gathered 63 scientists, 11 of whom were graduate students, from 16 countries and different areas of expertise, including Earth sciences, oceanography, paleontology, microbiology, soil and plant sciences, and hydrology. The conference focused on the use of stable oxygen isotopes in phosphate. New developments in preparation and analytical techniques have made the application of this tracer viable for fields other than paleoclimatology. However, new challenges with respect to sample preparation, standardization, its use in conjunction with other tracers, and the effect of biochemical processes have arisen.

Tamburini, F.; Bernasconi, S. M.; Paytan, A.



Detecting Novelty and Significance  

PubMed Central

Studies of cognition often use an “oddball” paradigm to study effects of stimulus novelty and significance on information processing. However, an oddball tends to be perceptually more novel than the standard, repeated stimulus as well as more relevant to the ongoing task, making it difficult to disentangle effects due to perceptual novelty and stimulus significance. In the current study, effects of perceptual novelty and significance on ERPs were assessed in a passive viewing context by presenting repeated and novel pictures (natural scenes) that either signaled significant information regarding the current context or not. A fronto-central N2 component was primarily affected by perceptual novelty, whereas a centro-parietal P3 component was modulated by both stimulus significance and novelty. The data support an interpretation that the N2 reflects perceptual fluency and is attenuated when a current stimulus matches an active memory representation and that the amplitude of the P3 reflects stimulus meaning and significance.

Ferrari, Vera; Bradley, Margaret M.; Codispoti, Maurizio; Lang, Peter J.



Design, construction and test of mercury thermometric cell in CENAMEP AIP  

NASA Astrophysics Data System (ADS)

We present the results of the design, construction, filling and test of thermometric cell, to reproduce the triple point of mercury in the Temperature Laboratory of Centro Nacional de Metrología de Panamá AIP (CENAMEP AIP). This cell will be included in the group of thermometric cells of the laboratory. With this cell CENAMEP-AIP is covering the -39 °C to 660 °C range. This new cell offers the opportunity to reproduce the primary temperature defined by ITS-90 of -38.8344 ° C, and was built with 0.68 kg of mercury ultra-pure certified by the National Institute of Standards and Technology from United States (NIST-EEUU). The reproducibility obtained with thermometric cell of mercury is approximately one thousandth of kelvin (1 mK). This value satisfies according to current laboratory equipment.

Ortega-Cortés, R.; Méndez-Lango, E.; Araolaza-Rodriguez, A.



Orbits of Stars in a Model with Three First Integrals  

NASA Astrophysics Data System (ADS)

RESUNEN. Se apliCa una forma integrable del potencial de la Galaxia para describir la variaci6n de los pericentros y apoCentros de las 6rbitas de las estrellas de acuerdo C0fl SuS velocidades en el entorno solar. Conio ejemplo, se presenta Un estudio mas detallado de la 6rbita del 501. A8STRACT. An integrable form of the potential of the Galaxy is applied to describe the variation of the pericentres and the apocentres of the orbits of stars in accordance with their velocities in the solar neighbourhood. As an example, a more detailed study of the orbit of the Sun is presented. Key words: DYNAMICS -- GALAXY-STRUCTURE

Cortes, P.; Sala, F.



Enrichment, concentration and retention processes in relation to anchovy (Engraulis ringens) eggs and larvae distributions in the northern Humboldt upwelling ecosystem  

NASA Astrophysics Data System (ADS)

A Lagrangian model is used to simulate and quantify in the northern Humboldt upwelling ecosystem the processes of enrichment, concentration and retention, identified by Bakun [Bakun, A., 1996. Patterns in the ocean. Ocean processes and marine population dynamics. University of California Sea Grant, California, USA, in cooperation with Centro de Investigaciones Biologicas de Noroeste, La Paz, Baja California Sur, Mexico, 323 pp.] as being important for the survival and recruitment of early life stages of pelagic fish. The method relies on tracking the positions of particles within water velocity fields generated by a three-dimensional hydrodynamic model. Simple criteria for considering particles as participating to enrichment, concentration or retention are used to derive indices of the three processes. We analyse the spatial distribution of and seasonal variability in these indices. The results are discussed in relation to anchovy (Engraulis ringens) eggs and larvae distributions off Peru, and to a comparable study conducted in the southern Benguela upwelling ecosystem.

Lett, Christophe; Penven, Pierrick; Ayón, Patricia; Fréon, Pierre



Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6  

NASA Astrophysics Data System (ADS)

We report multiferroic behaviour in double perovskite Y2CoMnO6 with ferroelectric transition temperature Tc = 80 K. Both X-ray diffraction and neutron scattering data confirm a centro-symmetric crystal structure of space group P21/n at room temperature. The saturation polarization and magnetization are estimated to be 65 ?C/m2 and 6.2 ?B/f.u. respectively. The magneto-electric coupling parameter, on the other hand, is small as a 5 T field suppresses the electric polarization by only ~8%. The origin of ferroelectricity is associated with magnetic ordering of Co2+ and Mn4+ moments in ??-?? arrangement. A model based on exchange-striction is proposed to explain the observed high temperature ferroelectricity.

Sharma, G.; Saha, J.; Kaushik, S. D.; Siruguri, V.; Patnaik, S.



A High Resolution Phoswich Detector: LaBr{sub 3}(Ce) Coupled With LaCl{sub 3}(Ce)  

SciTech Connect

An innovative solution for the forward end-cap CALIFA calorimeter of R{sup 3}B is under investigation consisting of two scintillation crystals, LaBr{sub 3} and LaCl{sub 3}, stacked together in a phoswich configuration with one readout only. This dispositive should be capable of a good determination of the energy of protons and gamma radiation. This composite detector allows to deduce the initial energy of charged particles by DELTAE1+DELTAE2 identification. For gammas, the simulations show that there is a high probability that the first interaction occurs inside the scintillator at few centimeters, with a second layer, the rest of the energy is absorbed, or it can be used as veto event in case of no deposition in the first layer. One such a detector has been tested at the Centro de MicroAnalisis de Materiales (CMAM) in Madrid. Good resolution and time signal separation have been achieved.

Carmona-Gallardo, M.; Borge, M. J. G.; Briz, J. A.; Gugliermina, V.; Perea, A.; Tengblad, O.; Turrion, M. [Instituto de Estructura de la Materia, CSIC. C/Serrano, 113-bis, E-28006 Madrid (Spain)



Neural activation during the processing of ambiguous fearful facial expressions: an ERP study in anxious and nonanxious individuals.  


Event-related brain potentials (ERPs) were recorded from anxious and nonanxious participants during performance on a fear detection task. Sequential presentation of gradually increasing fear cues from neutral to fearful allowed an examination of anxiety-related differences in the neural activation patterns corresponding to participants' overt detection of fear in ambiguous stimuli as well as the activation patterns corresponding to stages of fear processing preceding overt fear detection. While centro-parietal Late Positive Potential (LPP) amplitude of nonanxious participants was significantly modulated by increases in stimulus fear intensity preceding overt fear detection, no such LPP sensitivity was detected in anxious participants. Additionally, anxiety group differences as well as emotion related modulation were found for earlier ERP components (P1, P2 and EPN). These findings reveal an anxiety-related dissociation between the early and late processing stages of threat processing. Implications are discussed in light of existing theories of cognitive biases in anxiety. PMID:21846487

Frenkel, Tahl I; Bar-Haim, Yair



Analysis of cosmic ray variations observed by the CARPET in association with solar flares in 2011-2012  

NASA Astrophysics Data System (ADS)

The CARPET cosmic ray detector was installed on April 2006 at CASLEO (Complejo Astronmico El Leoncito) at the Argentinean Andes (31.8S, 69.3W, 2550 m, Rc=9.65 GV). This instrument was developed within an international cooperation between the Lebedev Physical Institute RAS (LPI; Russia), the Centro de Radio Astronomia e Astrofsica Mackenzie (CRAAM; Brazil) and the Complejo Astronmico el Leoncito (CASLEO; Argentina). In this paper we present results of analysis of cosmic ray variations recorded by the CARPET during increased solar flare activity in 2011-2012. Available solar and interplanetary medium observational data obtained onboard GOES, FERMI, ISS, as well as cosmic ray measurements by ground-based neutron monitor network were also used in the present analysis.

Makhmutov, V.; Raulin, J.-P.; De Mendonca, R. R. S.; Bazilevskaya, G. A.; Correia, E.; Kaufmann, P.; Marun, A.; Fernandez, G.; Echer, E.



Investigation of third order nonlinear optical properties in s-indacene-1,3,5,7(2H,6H)-tetraone based D-?-A-?-D chromophores by z-scan  

NASA Astrophysics Data System (ADS)

Here we describe the synthesis and characterization of a series of centro-symmetric D-?-A-?-D chromophores based on an s-indacene-1,3,5,7(2H,6H)-tetraone acceptor with conjugated linkers containing thiophene and pyrrole moieties. These materials were studied by UV visible absorption spectroscopy and their third order nonlinear optical properties investigated by z-scan at 1064 nm. The introduction of conjugated pyrrole linkers was found to give an effective third order hyperpolarizability of -1.54 x10-30 esu, and an effective two photon absorption cross section of 6100 GM at 1064 nm. As these chromophores showed comparatively high effective nonlinear absorption they have potential in photonic applications such as optical limiting, optical communication, and for two photon initiated polymerization.

Breukers, R. D.; Middleton, A. P.; Janssens, S.; Raymond, S. G.; Clarke, D. J.; Kay, A. J.; Smith, G. J.



Clinical and radiological correlates of somatosensory evoked potentials in the late phase of head injury: a study of 500 Vietnam veterans.  


Somatosensory evoked potentials were obtained after median nerve stimulation in 500 Vietnam veterans surviving penetrating head wounds 12-16 years earlier and 76 age-matched, uninjured controls. The results were studied in relation to neurologic history and findings, anatomical data provided by CT scan, and information derived from electroencephalograms. Thirty-five percent of head-injured individuals had abnormal SEPs and 76% of SEP abnormalities consisted of absence of N20 or N20/P25 complex. SEP abnormality correlated (P greater than 0.001) with the extent of total brain volume loss, sensory deficits (especially position and cortical discriminatory modalities), hemiparesis, organic mental disorder, CT evidence of parietal or thalamic injury, and centro-parietal EEG abnormalities. Recovery from hemiparesis was correlative with patients who subsequently had normal SEPs. PMID:2441962

Jabbari, B; Vance, S C; Harper, M G; Salazar, A M; Smutok, M A; Amin, D



Regular Motions of Resonant Asteroids  

NASA Astrophysics Data System (ADS)

RESUMEN. Se revisan resultados analiticos relativos a soluciones regulares del problema asteroidal eliptico promediados en la vecindad de una resonancia con jupiten Mencionamos Ia ley de estructura para libradores de alta excentricidad, la estabilidad de los centros de liberaci6n, las perturbaciones forzadas por la excentricidad de jupiter y las 6rbitas de corotaci6n. ABSTRAC This paper reviews analytical results concerning the regular solutions of the elliptic asteroidal problem averaged in the neighbourhood of a resonance with jupiter. We mention the law of structure for high-eccentricity librators, the stability of the libration centers, the perturbations forced by the eccentricity ofjupiter and the corotation orbits. Key words: ASThROIDS

Ferraz-Mello, S.



Biochemical markers in carbon-tetrachloride-and galactosamine-induced acute liver injuries: the effects of dihydroquinoline-type antioxidants.  

PubMed Central

The pharmacological action and possible therapeutic uses of some recently developed synthetic, non-toxic dihydroquinoline-type antioxidants were studied. The effect of the lipid-soluble 6,6-methylene-bis (2,2,4-trimethyl-1,2-dihydroquinoline) (n = 1, 2 or 3) (MTDQ) on carbon-tetrachloride-induced acute liver injuries was investigated, and that of the water-soluble 6,6-methylene-bis (2,2-dimethyl-4-methansulphonic acid sodium-1,2-dihydroquinoline) (MDS) on galactosamine-induced acute liver injuries in CFLP mice (Lati, Hungary). MTDQ was found suitable for the prevention of acute CCl4-induced liver injuries and MDS for that of acute galactosamine-induced liver injuries. Disappearance or significant diminution of the morphological signs and lesions of lipid degeneration and centro-lobular liver necrosis, decrease of serum GOT activities, and also inflammatory changes induced by galactosamine were observed. Images Fig. 3 Fig. 4

Feher, J.; Bar-Pollak, Z.; Sreter, L.; Feher, E.; Toncsev, H.



Aspergillosis in Larus cachinnans micaellis: survey of eight cases.  


Avian aspergillosis is reported in several avian species, with Aspergillus fumigatus as the main aetiological agent. Predisposing factors such as starvation, thermal stress, migratory stress, primary infectious disease or toxicosis may play a role. Eight cases of disseminated aspergillosis in free ranging seagulls sheltered at C.R.U.M.A. (Centro Recupero Uccelli Marini e Acquatici, Livorno, Italy) with different clinical histories are presented. The infection was demonstrated by cultural and histological methods from lesions of all birds, and the presence of airborne A. fumigatus viable elements ranging from 450 to 525 CFU/m(3) inside and outside the shelter by means of a surface air sampler (SAS) Super-90 was also assessed. The role of this fungal species as an opportunistic factor in the captivity of seagulls is considered and some control measures, such as a clean and stress free environment and the use of antifungal drugs are suggested. PMID:16649081

Nardoni, Simona; Ceccherelli, Renato; Rossi, Giacomo; Mancianti, Francesca



Observaciones del disco solar y de una protuberancia quiescente en radiación ultravioleta  

NASA Astrophysics Data System (ADS)

Observaciones del disco solar y de una protuberancia quiescente en el rango de longitudes de onda ultravioleta fueron obtenidas con el instrumento CDS (Coronal Diagnostic Spectrograph) y SUMER (Solar Ultraviolet Measurements of emitted radiation) a bordo de la sonda SOHO. El propósito es investigar las velocidades macroscópicas de varias especies metálicas que se observan tanto en el disco solar como en el plasma de las protuberancias. Para calcular las velocidades del disco solar aplicamos una técnica mixta para modelar la distribución de estructuras en UV en el Sol quieto. Las velocidades macroscópicas en las protuberancias se calcularon a partir de los corrimientos Doppler en cada línea espectral y luego se tomaron las del disco solar como referencia. Obtuvimos valores absolutos para las velocidades macroscópicas entre 5 y 40 km/seg. También detectamos comportamientos diferentes en las velocidades de las protuberancias en el centro con respecto a los bordes.

Cirigliano, D.; Vial, J.-C.; Rovira, M.


State-selective electron capture in {sup 3}He{sup 2+} + He collisions at intermediate impact energies  

SciTech Connect

In this work we have measured single-electron capture in collisions of {sup 3}He{sup 2+} projectiles incident on a helium target for energies of 13.3-100 keV/amu with the cold-target recoil-ion momentum spectroscopy setup implemented at the Centro Atomico Bariloche. State-selective single-capture cross sections were measured as a function of the impact energy. They were found to agree with previous existing data from the Frankfurt group, starting at the impact energy of 60 keV/amu; as well as with recent data, at 7.5 keV/amu, from the Lanzhou group. The present experimental results are also contrasted to the classical trajectory Monte Carlo method with dynamical screening.

Alessi, M. [Instituto Balseiro, Av. E. Bustillo 9500, 8400 San Carlos de Bariloche (Argentina); Centro Atomico Bariloche, Av. E. Bustillo 9500, 8400 San Carlos de Bariloche (Argentina); Otranto, S. [CONICET and Departamento de Fisica Universidad Nacional del Sur, Av. Alem 1253, 8000 Bahia Blanca (Argentina); Focke, P. [Centro Atomico Bariloche, Av. E. Bustillo 9500, 8400 San Carlos de Bariloche (Argentina)



The IMGC/CENAM-HG6 mercury manobarometer  

NASA Astrophysics Data System (ADS)

The Centro Nacional de Metrología (CENAM, Mexico) has established a national primary standard for barometric pressure based on a mercury column and a laser interferometer, the first in this range in Latin America. The original design of the manobarometer, the HG5, was made at the Istituto di Metrologia 'Gustavo Colonnetti' (CNR-IMGC, Italy) and it served to develop this new version, the IMGC/CENAM-HG6 mercury manobarometer which was constructed and assembled at CENAM. The special features of this new version and its main design characteristics are presented here, together with the differences from its predecessor. To verify its performance, an internal comparison in absolute mode (gas, N2) was carried out with a primary pressure balance, a piston-cylinder assembly with 50 mm diameter having direct traceability to SI base units and measuring range to 2.5 kPa to 175 kPa. The results of the comparison are presented and discussed.

Torres-Guzman, J. C.; Olvera-Arana, P.; Alasia, F.; Sardi, M.; Zuñiga, S.; Santander, L. A.; Esparza, A.



Development of a Tracking System of Exotic Nuclear Beams for FAIR  

NASA Astrophysics Data System (ADS)

New accelerators like SPIRAL2 (GANIL, France) or FAIR (GSI, Germany) will be soon constructed, and they will be able to produce radioactive ion beams (RIB) with high intensities of current (>=106 pps). These beams, at low energy, lower than 20 MeV/n, usually have high emittance, which imposes the use of tracking detectors before the target in order to reconstruct the trajectory of the ions. The group of Nuclear Physics at CNA (Centro Nacional de Aceleradores), is in charge of developing a tracking system for the low energy branch of FAIR (the HISPEC/DESPEC project). A collaboration with CEA-SACLAY was established, with the aim of developing, building and testing low pressure Secondary electron Detectors (SeD). Within this proposal we have projected and constructed a new Nuclear Physics Line in the CNA in order to be able to receive any kind of detector tests and the associated nuclear instruments.

Fernández, B.; Pancin, J.; Abou-Haidar, Z.; Alvarez, M. A. G.; Drouart, A.; Kebbiri, M.; Riallot, M.



Development of a Tracking System of Exotic Nuclear Beams for FAIR  

SciTech Connect

New accelerators like SPIRAL2 (GANIL, France) or FAIR (GSI, Germany) will be soon constructed, and they will be able to produce radioactive ion beams (RIB) with high intensities of current (>=10{sup 6} pps). These beams, at low energy, lower than 20 MeV/n, usually have high emittance, which imposes the use of tracking detectors before the target in order to reconstruct the trajectory of the ions. The group of Nuclear Physics at CNA (Centro Nacional de Aceleradores), is in charge of developing a tracking system for the low energy branch of FAIR (the HISPEC/DESPEC project). A collaboration with CEA-SACLAY was established, with the aim of developing, building and testing low pressure Secondary electron Detectors (SeD). Within this proposal we have projected and constructed a new Nuclear Physics Line in the CNA in order to be able to receive any kind of detector tests and the associated nuclear instruments.

Fernandez, B.; Abou-Haidar, Z.; Alvarez, M. A. G. [Departamento de Fisica Atomica, Molecular y Nuclear, Universidad de Sevilla, 41012 Sevilla (Spain); CNA-Centro Nacional de Aceleradores, Universidad de Sevilla, 41092 Sevilla (Spain); Pancin, J. [GANIL-Caen (France); Drouart, A.; Kebbiri, M.; Riallot, M. [CEA-Saclay (France)



Size effect on shape recovery and induced strain of NiTi nanowires  

NASA Astrophysics Data System (ADS)

The nanomechanical properties, the mechanism of fracture, and the shape recovery of NiTi nanowires under the nanobending test by an atomic force microscope tip are studied using molecular dynamics simulations. The effects of the nanowire diameter and heat treatment are evaluated in terms of atomic trajectories, loading force, adhesion, stress, slip vector, centro-symmetry parameter, Young's modulus, and yield strength. Simulation results show that the occurrence of initial adhesion deformation depends on the nanowire diameter. The nanomechanical strength of a NiTi nanowire can be enhanced by decreasing its diameter. NiTi nanowires in the high-temperature austensite phase have better nanomechanical strength than those of nanowires in the low-temperature martensite phase. During deformation, dislocations glide along the {1 1 0} planes inside the nanowire. The shape recovery after loading on the (1 0 0) surface is faster than that on the (1 1 0) surface.

Sung, Po-Hsien; Wu, Cheng-Da; Fang, Te-Hua; Weng, Cheng-I.



Traffic and catalytic converter - related atmospheric contamination in the metropolitan region of the city of Rio de Janeiro, Brazil.  


In this work, 24-h PM10 samples were collected in Rio de Janeiro, Brazil, and analysed for trace elements (Cd, Ce, Cu, La, Mo, Ni, Pb, Pd, Rh, Sb and Sn). The sampling was carried out at five locations (Bonsucesso; Centro, downtown city; Copacabana; Nova Iguaçu and Sumaré) with different traffic densities and anthropogenic activities. An analytical method based on the EPA method for the determination of trace elements in airborne particulate matter (PM), using ultrasonic-assisted extraction and inductively coupled plasma mass spectrometry (ICP-MS) was applied. Our results suggest that vehicular traffic is the most important source of environmental pollution at the studied sites. The presence of Mo, Pd and Rh in the analysed filters reflects an additional source of pollution caused by the erosion and deterioration of automotive catalytic converters. PMID:18082244

da Silva, Lílian Irene Dias; de Souza Sarkis, Jorge Eduardo; Zotin, Fátima Maria Zanon; Carneiro, Manuel Castro; Neto, Arnaldo Alcover; da Silva, Alzira dos Santos Amaral Gomes; Cardoso, Mauri José Baldini; Monteiro, Maria Inês Couto



An integrated accelerator mass spectrometry radiocarbon dating and ion beam analysis approach for the study of archaeological contexts  

NASA Astrophysics Data System (ADS)

The integration in the accelerator-based facility at CEDAD (Centro di Datazione e Diagnostica), University of Lecce, of a state-of-the art AMS (accelerator mass spectrometry) 14C dating system, and three different beam lines for IBA (ion beam analysis) compositional investigations, has given the possibility of developing an integrated IBA-AMS approach to the study of a wide range of archaeological problems. Here we present three cases where in air IBA methods were involved for the elemental characterisation of objects found in archaeological contexts, chronologically defined on the basis of high resolution AMS14C measurements. In particular we report on the identification of cinnabar (HgS) on Neolithic bones, the compositional analysis of a set of golden artefacts dated at the final Bronze age, and the analysis of red decorations on Neolithic pottery.

Quarta, G.; D'Elia, M.; Butalag, K.; Maruccio, L.; Demortier, G.; Calcagnile, L.



Clinical fitting of CAD/CAM zirconia single crowns generated from digital intraoral impressions based on active wavefront sampling.  


OBJECTIVES: The aim of this clinical trial was to test the accuracy of single all-ceramic zirconia crowns resulting from digital intraoral impressions with active wavefront sampling technology by measuring the marginal and internal fits of the crowns. MATERIALS AND METHODS: Thirty-seven teeth (24 anterior and 13 posterior) in fifteen patients were restored with single zirconia-ceramic crowns (Lava/Lava Ceram; 3M ESPE) generated from a digital intraoral scanner (Lava Chairside Oral Scanner; 3M ESPE). Before definitive insertion, silicone replicas were produced for all 37 crowns. The sample was cut in four sections; each section was evaluated in four points: marginal gap, mid-axial wall, axio-occlusal edge and centro-occlusal. A total of 592 measurements (148 for each evaluation point) was examined using stereomicroscopy with a magnification of 50×. The Mann-Whitney U test was used to evaluate whether there were differences between anterior and posterior values (alpha=0.05). RESULTS: The mean values for each point were: 48.65?m (SD 29.45?m) for the marginal gap, 112.25?m (SD 55.54?m) at the mid-axial wall, 137.81?m (SD 71.31?m) at the axio-occlusal edge of the abutments, and 157.25?m (SD 75.51?m) at the centro-occlusal location. No statistical differences were found between the anterior and posterior group for each point (p-values: P1=0.39; P2=0.38; P3=0.07; P4=0.30). CONCLUSIONS: The marginal and internal fitting values obtained were within literature agreed as clinically acceptable for both anterior and posterior teeth. CLINICAL RELEVANCE: Single crown restorations obtained using digital intraoral impressions based on active wavefront sampling technology presented enough accuracy to be used as an alternative to the conventional impression techniques. PMID:22027653

Scotti, Roberto; Cardelli, Paolo; Baldissara, Paolo; Monaco, Carlo



On the constraining observations of the dark GRB 001109 and the properties of a z = 0.398 radio selected starburst galaxy contained in its error box  

NASA Astrophysics Data System (ADS)

We present optical and NIR (near infrared) follow up observations of the GRB 001109 from 1 to 300 days after the burst. No transient emission was found at these wavelengths within this GRB's (Gamma Ray Burst) 50 arcsec radius BeppoSAX error box. Strong limits (3?) are set with: R ? 21, 10.2 h after the GRB; I ? 23, 11.4 h after the GRB; H ? 20.7, 9.9 h after the GRB; and KS? 20, 9.6 h after the GRB. We discuss whether the radio source found in the GRB's error box (\\cite{taylor00}) might be related to the afterglow. We also present a multiwavelength study of a reddened starburst galaxy, found coincident with the potential radio and the X-ray afterglow. We show that our strong I band upper limit makes of the GRB 001109 the darkest one localised by the BeppoSAX's NFI (Narrow Field Instrument), and it is one of the most constraining upper limits on GRB afterglows to date. Further to it, the implications of these observations in the context of dark GRBs are considered. Based on observations made with telescopes at the Centro Astronómico Hispano Alemán (1.23 m + 3.50 m), at the Observatorio del Roque de los Muchachos (NOT + WHT), at the United States Naval Observatory (1.00 m) and at the Russian Academy of Sciences's Special Astrophysical Observatory (6.05 m). The NOT is operated on the island of San Miguel de la Palma jointly by Denmark, Finland, Iceland, Norway and Sweden, in Spain's Observatorio del Roque de los Muchahos of the Instituto de Astrofísica de Canarias. The Centro Astronómico Hispano Alemán is operated in Calar Alto by the Max-Planck Institut für Astronomie of Heidelberg, jointly with Spain's Comisión Nacional de Astronomía.

Castro Cerón, J. M.; Gorosabel, J.; Castro-Tirado, A. J.; Sokolov, V. V.; Afanasiev, V. L.; Fatkhullin, T. A.; Dodonov, S. N.; Komarova, V. N.; Cherepashchuk, A. M.; Postnov, K. A.; Lisenfeld, U.; Greiner, J.; Klose, S.; Hjorth, J.; Fynbo, J. P. U.; Pedersen, H.; Rol, E.; Fliri, J.; Feldt, M.; Feulner, G.; Andersen, M. I.; Jensen, B. L.; Pérez Ramírez, M. D.; Vrba, F. J.; Henden, A. A.; Israelian, G.; Tanvir, N. R.



Oscillatory Brain Correlates of Live Joint Attention: A Dual-EEG Study.  


Joint attention consists in following another's gaze onto an environmental object, which leads to the alignment of both subjects' attention onto this object. It is a fundamental mechanism of non-verbal communication, and it is essential for dynamic, online, interindividual synchronization during interactions. Here we aimed at investigating the oscillatory brain correlates of joint attention in a face-to-face paradigm where dyads of participants dynamically oriented their attention toward the same or different objects during joint and no-joint attention periods respectively. We also manipulated task instruction: in socially driven instructions, the participants had to follow explicitly their partner's gaze, while in color-driven instructions, the objects to be looked at were designated at by their color so that no explicit gaze following was required. We focused on oscillatory activities in the 10?Hz frequency range, where parieto-occipital alpha and the centro-parietal mu rhythms have been described, as these rhythms have been associated with attention and social coordination processes respectively. We tested the hypothesis of a modulation of these oscillatory activities by joint attention. We used dual-EEG to record simultaneously the brain activities of the participant dyads during our live, face-to-face joint attention paradigm. We showed that joint attention periods - as compared to the no-joint attention periods - were associated with a decrease of signal power between 11 and 13?Hz over a large set of left centro-parieto-occipital electrodes, encompassing the scalp regions where alpha and mu rhythms have been described. This 11-13?Hz signal power decrease was observed independently of the task instruction: it was similar when joint versus no-joint attention situations were socially driven and when they were color-driven. These results are interpreted in terms of the processes of attention mirroring, social coordination, and mutual attentiveness associated with joint attention state. PMID:22675297

Lachat, Fanny; Hugueville, Laurent; Lemaréchal, Jean-Didier; Conty, Laurence; George, Nathalie



Oscillatory Brain Correlates of Live Joint Attention: A Dual-EEG Study  

PubMed Central

Joint attention consists in following another’s gaze onto an environmental object, which leads to the alignment of both subjects’ attention onto this object. It is a fundamental mechanism of non-verbal communication, and it is essential for dynamic, online, interindividual synchronization during interactions. Here we aimed at investigating the oscillatory brain correlates of joint attention in a face-to-face paradigm where dyads of participants dynamically oriented their attention toward the same or different objects during joint and no-joint attention periods respectively. We also manipulated task instruction: in socially driven instructions, the participants had to follow explicitly their partner’s gaze, while in color-driven instructions, the objects to be looked at were designated at by their color so that no explicit gaze following was required. We focused on oscillatory activities in the 10?Hz frequency range, where parieto-occipital alpha and the centro-parietal mu rhythms have been described, as these rhythms have been associated with attention and social coordination processes respectively. We tested the hypothesis of a modulation of these oscillatory activities by joint attention. We used dual-EEG to record simultaneously the brain activities of the participant dyads during our live, face-to-face joint attention paradigm. We showed that joint attention periods – as compared to the no-joint attention periods – were associated with a decrease of signal power between 11 and 13?Hz over a large set of left centro-parieto-occipital electrodes, encompassing the scalp regions where alpha and mu rhythms have been described. This 11–13?Hz signal power decrease was observed independently of the task instruction: it was similar when joint versus no-joint attention situations were socially driven and when they were color-driven. These results are interpreted in terms of the processes of attention mirroring, social coordination, and mutual attentiveness associated with joint attention state.

Lachat, Fanny; Hugueville, Laurent; Lemarechal, Jean-Didier; Conty, Laurence; George, Nathalie



Transferências orbitais dentro do modelo quase bicircular no sistema Terra-Lua-Sol  

NASA Astrophysics Data System (ADS)

O problema quase bicircular planar consiste na determinação da dinâmica de um corpo, de massa desprezível, que se move sob o campo gravitacional de três corpos. No caso estudado, o quarto corpo é considerado um satélite artificial e os demais são a Terra, a Lua e o Sol, formando o sistema de três corpos. Este modelo permite a construção de uma hamiltoniana similar a do problema restrito de três corpos (PRTC), incluindo termos periódicos não autônomos, provenientes da presença do Sol, portanto pode ser entendido como uma perturbação ao PRTC. Suas órbitas periódicas aparecem isoladas e possuem o mesmo período solar. Os pontos de equilíbrio colineares possuem o mesmo caráter de estabilidade linear dos pontos lagrangianos (L1, L2 e L3) do PRTC, sendo do tipo sela x centro x centro, instável na direção x e estáveis nas direções y e z. As órbitas periódicas tridimensionais ao redor do ponto colinear é chamada órbita Halo. O objetivo deste trabalho é determinar órbitas de transferências de baixo consumo de combustível para um veículo espacial partindo de uma órbita de estacionamento ao redor da Terra em direção a uma órbita Halo do ponto L1, situado entre a Terra e Lua. Esta tarefa pode ser transformada no problema de valor de contorno: dado um ponto inicial na órbita de estacionamento, um ponto final na órbita halo e o tempo de transferência, deseja-se obter a trajetória que liga estes dois pontos e que minimize os incrementos de velocidade do veículo. Essas transferências são realizadas baseadas no método de Lambert e analisadas de modo a fornecer um baixo consumo. Posteriormente, é feita uma comparação de consumo com as órbitas de transferência equivalentes do PRTC.

Corrêa, A. A.; de Almeida Prado, A. F. B.; Stuchi, T. J.; Beaugé, C.



Astronomía Gamma desde El Leoncito  

NASA Astrophysics Data System (ADS)

La astronomía gamma, en el extremo de energías detectadas hasta el presente, se encuentra en desarrollo en muchas partes del mundo y proporciona resultados sorprendentes a medida que la tecnología avanza en el desarrollo de nuevos detectores. La técnica Cherenkov Atmosférica es la utilizada para la detección, mediante telescopios en tierra, del efecto secundario causado por la radiación gamma de muy altas energías (E ? TeV). Por medio de telescopios o arreglos de detectores y utilizando la técnica mencionada, se han podido detectar algunas fuentes puntuales de mucha importancia astrofísica como la Nebulosa del Cangrejo y la galaxia de núcleo activo Markarian 421. El sistema instalado en San Juan, en cooperación con el grupo de Radiación Gamma del Observatorio Whipple, está constituído por tres colectores de 1.5m que registran pulsos de luz generados por las cascadas de partículas producidas por rayos cósmicos de todo tipo al entrar en la atmósfera terrestre. El sistema opera por barrido en ascención recta de la fuente observada que, para esta etapa del experimento, es el Centro Galáctico. Esta fuente extensa es conocida como emisor gamma de energías inferiores al TeV y ha sido observada anteriormente en este rango de energía desde el hemisferio norte pero con elevaciones bajas, situación no óptima para este tipo de técnica. Se presentan los primeros resultados del análisis de los datos obtenidos observando la región del Centro Galáctico, luego de dos años de observaciones, así como una descripción de la técnica Cherenkov Atmosférica y del equipo utilizado en la experiencia.

Rovero, A. C.; Colombo, E.; Sahade, J.; Weekes, T. C.


Estudio de la estructura logica utilizada en la ensenanza y el aprendizaje de los conceptos sobre el comportamiento de gases en el curso introductorio de quimica a nivel universitario  

NASA Astrophysics Data System (ADS)

El estudio que se presenta es de caracter cualitativo, un estudio multicasos donde se estudia la estructura logica utilizada por cuatro (4) profesores universitarios que ensenan el curso introductorio de quimica, en la planificacion, presentacion y evaluacion del tema sobre el comportamiento de los gases. Se utilizaron varias fuentes de informacion como: cuestionarios de profesores y estudiantes, entrevistas, grabaciones videomagnetofonicas, materiales didacticos y una prueba conceptual, entre otros. La informacion recopilada fue analizada de acuerdo al orden logico del contenido presentado, el estilo de ensenanza del profesor, las tecnicas y estrategias utilizadas para el desarrollo de destrezas de pensamiento, el ambiente fisico en el salon de clase y los instrumentos de evaluacion y avaluo. El estudio demuestra que lo que los profesores piensan y planifican para hacer sus presentaciones no necesariamente es lo que ocurre en el salon de clases. El desarrollo de destrezas de pensamiento, que constituye una prioridad de los profesores, no se elaboran efectivamente. El uso de las estrategias de resolucion de problemas numericos predomino. La participacion del estudiante en el salon de clases fue limitada y no se logro demostrar el desarrollo de las destrezas de pensamiento deseadas. Aunque los profesores tienen su propio estilo de ensenanza, el orden logico del contenido presentado en clase fue el mismo o siguio muy de cerca el orden establecido por el libro de texto. Los profesores utilizaron preferentemente la tiza y la pizarra para sus presentaciones y la dinamica en el salon de clases fue esencialmente tradicional. Los profesores hicieron su presentacion y los estudiantes copiaron pasivamente la informacion. Las evaluaciones de los estudiantes fueron esencialmente, pruebas escritas de seleccion multiple de acuerdo con el estilo en que se les enseno. El avaluo fue casi inexistente. La prueba conceptual administrada revela un aprendizaje pobre en los conceptos mas basicos sobre el comportamiento de los gases. El estudio senala que la ejecutoria del profesor en todos los aspectos de la ensenanza y el aprendizaje es un factor clave que debe darsele prioridad. Se recomienda que el profesor, en general, tenga un conocimiento basico de las teorias de aprendizaje, de los factores que afectan el aprendizaje y las tecnicas y estrategias mas efectivas en el desarrollo de destrezas de pensamiento entre sus estudiantes. La estructura de la disciplina debe incluir tanto lo experimental como lo teorico.

Costa Diaz, Agnes


Calendar of Conferences  

NASA Astrophysics Data System (ADS)

8 - 18 August 1996 International Summer School on Plasma Physics and Technology La Jolla, CA, USA Contact: Mr V Stefan, Institute for Advanced Physics Studies, PO Box 2964, La Jolla, CA 92038, USA. Tel +1-619-456-5737. 26 - 30 August 1996 Joint Varenna - Lausanne International Workshop on Theory of Fusion Plasmas Villa Monastero, Varenna, Italy Contact: Centro di Cultura Villa Monastero, 1 Piazza Venini, 22050 Varenna (Lecco), Italy. Tel +39-341-831261, Fax +39-341-831281. Application and abstract deadline: 15 June 1996. 2 - 5 September 1996 EU - US Workshop on Transport in Fusion Plasmas Villa Monastero, Varenna, Italy Further information: G Gorini, ISPP, 16 Via Celoria, I-20133 Milano, Italy. Tel +39-2-2392637, Fax +39-2-2392205, E-mail Administrative contact: Centro di Cultura Villa Monastero, 1 Piazza Venini, 22050 Varenna (Lecco), Italy. Tel +39-341-831261, Fax +39-341-831281. Application and abstract deadline: 15 June 1996. 9 - 13 September 1996 International Conference on Plasma Physics Nagoya, Japan Contact: Conference Secretariat, c/o Prof. Hiromu Momota, National Institute for Fusion Science, Nagoya 464-01, Japan. Tel +81-52-789-4260, Fax +81-52-789-1037, E-mail Abstract deadline: 31 March 1996. 16 - 20 September 1996 19th Symposium on Fusion Technology Lisbon, Portugal Contact: Professor Carlos Varandas, Centro de Fusão Nuclear, 1096 Lisboa Codex, Portugal. Fax +351-1-8417819, E-mail General information will be available via WWW with URL 25 - 29 September 1996 Summer University of Plasma Physics Garching, Germany Contact: Ms Ch Stahlberg, Max-Planck-Institut für PlasmaPhysik, Boltzmannstr 2, D-85748 Garching, Germany. Tel +49-89-3299-2232, Fax +49-89-3299-1001. 11 - 15 November 1996 38th Annual Meeting of the Division of Plasma Physics, APS Denver, CO, USA Contact: Dr Richard Hazeltine, University of Texas, Institute for Fusion Studies, RLM 11.314, Austin, TX 78712. Tel +1-512-471-1322, E-mail 17 - 18 February 1997 Plasma '97: 21st Australian Institute of Nuclear Science and Engineering Plasma Science and Technology Conference Sydney, Australia Contact: Margaret Lanigan, Conference Manager, PMB 1, MENAI NSW 2234, Australia. Fax +61-(0)2-439-6561, E-mail 6 - 11 April 1997 10th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating Ameland, The Netherlands Contact: J Hamers-Smit, FOM - Instituut voor Plasmafysica 'Rijnhuizen', Postbus 1207, 3430 BE Nieuwegein. Tel +31-30-6096999, Fax +31-30-6031204, E-mail Application and abstract deadline: 17 January 1997. 8 - 12 September 1997 12th International Conference on Gas Discharges and their Applications Greifswald, Germany Contact: Dr G Babucke, Inst. f. Niedertemperatur-Plasmaphysik, Robert-Blum-Str. 8 - 10, 17489 Greifswald, Germany. Tel +49-3834-554411, Fax +49-3834-554301, E-mail



PREFACE: International Conference on Control and Synchronization of Dynamical Systems (CSDS-2005)  

NASA Astrophysics Data System (ADS)

This volume of Journal of Physics: Conference Series contains selected articles by the participants at the International Conference on Control and Synchronization of Dynamical Systems (CSDS-2005) organized by Centro de Investigaciones en Optica (CIO) in cooperation with the Society for Industrial and Applied Mathematics (SIAM), which was held in Leon, Guanajuato, Mexico on 4-7 October 2005. CSDS-2005 featured the latest research in nonlinear dynamics concentrating on the theory of control and synchronization of complex systems and its applications in different areas of science and engineering, including optics, electronics, mechanics, chemistry, medicine, economy, communication, etc. The conference brought together leading researchers, both theoreticians and experimentalists, from different fields of science and provided an excellent opportunity for sharing ideas and problems among specialists in controlling dynamical systems and synchronization. The meeting served a dual purpose: to expose the scientific community to the cutting edge of forefront research done by leaders in this area from as many as 25 countries and to attract the attention of Mexican researchers to this field of science. These proceedings are intended to be a record of this conference and to serve as a reference for future research which the conference hopes to have initiated. After the pioneering work on controlling chaos of E Ott, C Grebogi and J Yorke appeared in Physical Review Letters in 1990, the number of works on this topic grew tremendously. Our extensive bibliographic search among 110 peer reviewed journals yielded more than 1500 papers on controlling chaos and more than 2500 on synchronization of chaotic systems published during the last decade. The numbers of publications are still at their peaks that began to saturate, in 1998 and 2003, respectively. It is my pleasure to acknowledge the contribution of the program and organizing committees, the funding agencies and cooperating organizations, and the staff of CIO in organizing CSDS-2005. I am very grateful to all plenary and invited speakers for their acceptance of our invitation. Their contributions enhanced significantly the prestige of our conference. I would like to express my special thanks to Prof. Jürgen Kurths for his agreement to give a tutorial course on synchronization after the meeting. My sincere thanks are also due to Dr Fernando Mendoza-Santoyo, the General Director of CIO, and to Dr Ramón Rodriguez-Vera, the Research Director, for facilitating the use of institutional infrastructure, as well as for their interest and help in organization of the conference. I record my special thanks to Annette Torres for her invaluable secretarial work, to Bernardo Ruiz-Olvera for his help in visa processing, and to Carolina Arriola for designing the conference website and printed materials. I would also like to thank all my students for their assistance in holding the meeting. In the publication of the conference proceedings, I am grateful to our referees (V Aboites, V Afraimovich, F T Arecchi, A D'Anjou, C Grebogi, V Erofeyev, Hongjie Yu, L Kalyakin, A Karami, S K Dana, A K Das, J Kurths, A Loskutov, G Luna, R Meucci, C R Mirasso, C L Pando, P Parmananda, Qinhua Hu, R Rechtman, P K Roy, R Roy, N Rulkov, E A Sataev, A Shil'nikov, S Sinha, V M Somsikov, N N Verichev, U E Vincent, A Volkovskii, J Zebrowski) for their knowledgeable and careful comments, and to Dr Rider Jaimes-Reátegui and Dr Hugo Garcia-Lopez for helping me with the editorial process. Finally, I thank the Institute of Physics Editorial team for publishing these proceedings very rapidly and efficiently. International Program Committee V Afraimovich (Universidad de San Luis Potosi, Mexico) T F Arecchi (University of Firenze, Italy) C Grebogi (Universidad de Sao Paulo, Brazil) J Haus (University of Dayton, USA) (OSA representative) J Kurths (University of Potsdam, Germany) F Mendoza-Santoyo (Centro de Investigaciones en Optica, Mexico) (General Director) A N Pisarchik (Centro de Investigaciones en Optica, Mexico) (Chair) R Roy

Pisarchik, Alexander N.



Mineral solubility of Panicum maximum with four herbaceous forage legume mixtures incubated in the rumen of N' Dama steers.  


This study was designed to determine the mineral concentration and bioavailability of iron (Fe), phosphorus (P), calcium (Ca) and sodium (Na) of mixtures of Panicum maximum (Panicum) with Lablab purpureus (Lablab), Centrosema pubescens (Centro), Stylosanthes guianensis (Stylo), and Aeschynomene histrix (Histrix) in a fistulated N'Dama steer. The solubility of minerals was determined by an in sacco method by incubating ground samples of these forages in the rumen at 0, 6, 12, 24, 48 and 72 h. The mineral solubility characteristics of the forages were evaluated using the equation PD = a + b (1 - e(-ct)). The result showed that Panicum intercropped with legumes had better crude protein (CP) (av. 9.22% DM) and ash content (av. 2.22% DM) than sole Panicum which gave 7.63% DM and 1.84% DM for CP and ash contents respectively. The highest value of CP of 23.29% DM and ash content (3.96% DM) was obtained for Lablab. The mineral content values of the intercrop were higher than the sole Panicum. Higher mineral content values were obtained in the sole legumes. Iron solubility values of b and potential degradation (PD) which were 58.71% and 87.92% respectively were for Panicum/Histrix mixtures. Calcium solubility values ranged from 30.0% in Panicum to 46.0% in Panicum/Lablab mixture for b fraction. P solubility ranged from 28.0% and 46.0% for b and PD fractions in Panicum to 43.0% and 71.0% in Panicum/Centro mixture respectively. The solubility of the legumes was higher in Na for b fraction (av. 42.0%) and PD fraction (av. 60.0%). Higher values of b (av. 38.0%) and PD (av. 52.0%) were obtained for the mixtures than for sole Panicum. This study revealed that intercropping Panicum with either of the herbaceous forage legumes used for this experiment would increase the Ca, P, Na and Fe contents of the grass. PMID:20163632

Ajayi, Festus T; Babayemi, Olaniyi Jacob; Taiwo, Abiodun A



Booklets for children related with Earth Sciences published in Mexico  

NASA Astrophysics Data System (ADS)

The Centro de Geociencias, at the Universidad Nacional Autonoma de Mexico, has published a series of booklets for children, entitled "Simple experiments to understand a complex Earth". It is part of the activities of the Mexican committee of the International Year of the Planet Earth. Each booklet contains experiments related with an Earth Sciences topic and includes the procedure to do one of the "Ten most beautiful experiments in physics" (Crease, P., Physics World May 2002 p17 and September 2002 pp19-20). In Mexico, as in other developing countries, there is very little information about Science in general and Earth Sciences in particular, in the basic education programs. Also, there is poor bibliography in Spanish about science experiments. For this reason, we try to fill the vacuum by distributing free the booklets in Science Museums and rural basic schools in paper, and by Internet in the Centro de Geociencias web site ( At present, we have been distributed 100,000 copies of 5 issues: 1."Atmospheric pressure and the falling bodies", it deals with the Galileo experiment of falling bodies, he proposed that all the bodies fall down at the same velocity. We discuss the properties of the atmosphere air (temperature, pressure and volume) and concluded that Galileo is right but when the bodies are very light. 2. "The light and the colors" is based in the Newton's decomposition of sunlight with a prism experiment. This booklet contains nine experiments to explain the colors that we find in Earth like the blue of the sky, the orange of the sunset, the rainbow and the mirage. 3. "¿Eureka! oceans and continents float". This booklet presents seven experiments related with density and buoyancy to explain the principles of the Plate tectonics theory. 4. "Climate hanging by a thread", Foucault pendulum demonstrates the rotation of Earth without seeing the stars, in this booklet, we explain, through 9 experiments, how the Earth's rotation influences climate. 5. "The Earth and its waves". This booklet presents seven experiments to explain how the knowledge of the wave behavior help us to understand phenomena like tsunamis, earthquakes, colors and telecommunications, etc. All the booklets are in Spanish, printing was sponsored by the Academia Mexicana de Ciencias, the Universidad Nacional Autonoma de Mexico among other institutions. We will bring to the EGU General Assembly some booklets to see if any institution is interested in publishing and distribute them in another language.

Alaniz, S. A.; Nieto-Samaniego, A. F.



PREFACE: 14th Latin American Workshop on Plasma Physics (LAWPP 2011)  

NASA Astrophysics Data System (ADS)

These proceedings present the written contributions from participants of the Latin American Workshop on Plasma Physics (LAWPP), which was held in Mar del Plata, Argentina, on 20-25 November 2011. This was the 14th session of the series of LAWPP biennial meetings, which started in 1982. The five-day scientific program of LAWPP 2011 consisted of 32 talks and various poster sessions, with the participation of 135 researchers from Argentina, Brazil, Canada, Chile, Colombia, Mexico, Puerto Rico, USA, Venezuela, as well as others from Europe and Asia. In addition, a School on Plasma Physics and a Workshop on Industrial Applications of Plasma Technology (AITP) were organized together with the main meeting. The five-day School held in the week previous to the meeting was intended for young scientists starting their research in Plasma Physics. On the other hand, the objective of the AITP Workshop was to enhance regional academic and industrial cooperation in the field of plasma assisted surface technology. Topics addressed at LAWPP 2011 included space plasmas, dusty plasmas, nuclear fusion, non-thermal plasmas, basic plasma processes, plasma simulation and industrial plasma applications. This variety of subjects is reflected in these proceedings, which the editors hope will result in enjoyable and fruitful reading for those interested in Plasma Physics. It is a pleasure to thank the Institutions that sponsored the meeting, as well as all the participants and collaborators for making this meeting possible. The Editors Luis Bilbao, Fernando Minotti and Hector Kelly LAWPP participants Participants of the 14th Latin American Workshop on Plasma Physics, 20-25 November 2011, Mar del Plata, Argentina International Scientific Committee Carlos Alejaldre, Spain María Virginia Alves, Brazil Ibere Caldas, Brazil Luis Felipe Delgado-Aparicio, Peru Mayo Villagrán, Mexico Kohnosuke Sato, Japan Héctor Kelly, Argentina Edberto Leal-Quirós, Puerto Rico George Morales, USA Julio Puerta, Venezuela Leopoldo Soto, Chile Michael Tendler, Sweden Carlos Varandas, Portugal Henry Riascos, Colombia Ivan Vargas-Blanco, Costa Rica Local Organizing Committee Luis Bilbao (Chairman) Fernando Minotti (Vice-Chairman) Luis Bernal, UNMDP Alejandro Clausse, PLADEMA-CNEA Graciela Gnavi, INFIP, CONICET-UBA Fausto Gratton, INFIP, CONICET-UBA Diana Grondona, INFIP, CONICET-UBA Héctor Kelly, INFIP, CONICET-UBA Adriana Márquez, INFIP, CONICET-UBA María Milanese, UNCPBA César Moreno, INFIP, CONICET-UBA Sponsors Instituto de Física del Plasma (INFIP) Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Comisión Nacional de Energía Atómica (CNEA) Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) Centro Latino-Americano de Física (CLAF) Universidad Nacional de Mar del Plata (UNMP) Universidad Nacional del Centro de la Provincia de Buenos Aires (UNICEN) Academia Nacional de Ciencias de Buenos Aires (ANCBA) Conference poster

Bilbao, Luis; Minotti, Fernando; Kelly, Hector



Calibration of three rainfall simulators with automatic measurement methods  

NASA Astrophysics Data System (ADS)

CALIBRATION OF THREE RAINFALL SIMULATORS WITH AUTOMATIC MEASUREMENT METHODS M. Roldán (1), I. Martín (2), F. Martín (2), S. de Alba(3), M. Alcázar(3), F.I. Cermeño(3) 1 Grupo de Investigación Ecología y Gestión Forestal Sostenible. ECOGESFOR-Universidad Politécnica de Madrid. E.U.I.T. Forestal. Avda. Ramiro de Maeztu s/n. Ciudad Universitaria. 28040 Madrid. 2 E.U.I.T. Forestal. Avda. Ramiro de Maeztu s/n. Ciudad Universitaria. 28040 Madrid. 3 Facultad de Ciencias Geológicas. Universidad Complutense de Madrid. Ciudad Universitaria s/n. 28040 Madrid The rainfall erosivity is the potential ability of rain to cause erosion. It is function of the physical characteristics of rainfall (Hudson, 1971). Most expressions describing erosivity are related to kinetic energy or momentum and so with drop mass or size and fall velocity. Therefore, research on factors determining erosivity leds to the necessity to study the relation between fall height and fall velocity for different drop sizes, generated in a rainfall simulator (Epema G.F.and Riezebos H.Th, 1983) Rainfall simulators are one of the most used tools for erosion studies and are used to determine fall velocity and drop size. Rainfall simulators allow repeated and multiple measurements The main reason for use of rainfall simulation as a research tool is to reproduce in a controlled way the behaviour expected in the natural environment. But in many occasions when simulated rain is used in order to compare it with natural rain, there is a lack of correspondence between natural and simulated rain and this can introduce some doubt about validity of data because the characteristics of natural rain are not adequately represented in rainfall simulation research (Dunkerley D., 2008). Many times the rainfall simulations have high rain rates and they do not resemble natural rain events and these measures are not comparables. And besides the intensity is related to the kinetic energy which determines the rainfall erosivity (Dunkerley D., 2008). A special attention must be paid to the experimental design and the understanding of the measurements obtained. The objective of this study is the calibration of simulated rain. In order to achieve this objective a rainfall simulator and disdrometer have been used. The first one is a nozzle type and its sprinkler system was located at different heights, three different spray nozzles supplied the water with known pressure. The simulated rainfall presented different intensities, drop diameters distribution and so different kinetic energy. The instrument of measurement for registering data is the disdrometer (Joss and Waldvogel, 1967) which provides the total number of impacts of raindrops, minute after minute, grouped in 20 classes according to their size which allows the real time measurements of the drop diameter distributions, kinetic energy per minute and intensity per minute. Disdrometer registers data in supposing drops fall down with terminal velocity but this velocity can reach up to 7-9 m of height in natural raindrop, depending on drop diameters. If the height of simulator is high enough the drops could recuperate their terminal velocities and their kinetic energies could be true. The nozzles were located to different heights in order to achieve these terminal velocities. These heights vary depending on the nozzles used, when the drops supplied by the nozzle are smaller the terminal velocity is reached sooner than when the drops are bigger. The physical characteristics of simulated rainfall in the three nozzles, intensity, drop diameter distributions and kinetic energy, are known and steady when the drops supplied by the nozzles reach terminal velocities.

Roldan, Margarita



Influence of biological soil crusts at different successional stages in the implantation of biogeochemical cycles in arid and semiarid zones  

NASA Astrophysics Data System (ADS)

Influence of biological soil crusts at different successional stages in the implantation of biogeochemical cycles in arid and semiarid zones I. Miralles1, F. Gil-Sotres2, Y. Cantón-Castilla3, F. Domingo1, M.C. Leirós2, C. Trasar-Cepeda4 1 Experimental Estation of Arid Zones (CSIC), E-04230 La Cañada de San Urbano, Almería, Spain. 2 Departamento Edafología y Química Agrícola, Grupo de Evaluación de la Calidad del Suelo, Unidad Asociada CSIC, Facultad de Farmacia, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain. 3 University of Almería, Departamento de Edafología y Química Agrícola, E-04230-La Cañada de San Urbano, Almería, Spain. 4 Departamento Bioquímica del Suelo, IIAG-CSIC, Apartado 122, E-15708 Santiago de Compostela, Spain. Crusts (BSCs) are formed by a close association between soil particles and cyanobacteria, algae, lichens, bryophytes and microfungi in varying proportions. Their habitat is within or immediately on top of the uppermost millimetres of the soil and are the predominant surface cover in arid and semiarid zones. Among the diverse functions developed by BSCs in the ecosystem (hydrology, erosion, soil properties, etc.), one of the most important is its role in nutrient cycling. Within arid and semiarid environments, BSCs have been termed 'mantles of fertility' being considered hotspots of biogeochemical inputs, fixing C, N and P above- and below-ground. However, there are differences in N and C fixation rates between BSCs types. Early successional BSCs, dominated by cyanobacterial species, fix lower quantities of C and N than mature BSCs dominated by lichens. Although the positive effects of BSCs on biogeochemical soil cycles are widely accepted, no previous studies have evaluated the activities of the enzymes involved in C, N and P cycles of BSCs and how they are affected by the successional stage of the BSC. In this work, performed in the Tabernas desert (SE Spain), we studied the hydrolase enzymes involved in C (invertase, CM-cellulase, ?-glucosidase), N (urease, BAA-protease, casein-protease) and P (phosphomonoesterase) cycles in BSCs at different successional stages (cyanobacteria represents the first successional stage, lichen Diploschistes diacapsis in an intermediate state and lichen Lepraria crassissima, with the greatest successional state). Our results show that BSCs at lower successional stage enriched the surface geological substrate in hydrolase enzymes to a lesser extent than mature BSCs (Lepraria crassissima), which show the highest values in all enzymatic activities. In contrast, the specific enzyme activities (activity values expressed per unit of carbon) were higher in the BSCs at lower successional stage, decreasing in the direction: cyanobacteria > Diploschistes diacapsis-lichen > Lepraria crassissima-lichen. These results suggest a different role of BSCs depending on their successional stage with regard to the implantation of biogeochemical cycles during the surface substrate colonization. Our conclusions are highly relevant to improve the knowledge of biogeochemical cycles in arid and semiarid areas. Keywords: Biological Soil Crusts, arid ecosystems, hydrolytic enzymes, biochemical activity

Gil-Sotres, F.; Miralles, I.; Canton-Castilla, Y.; Domingo, F.; Leiros, M. C.; Trasar-Cepeda, C.



Evolución de estrellas que pertenecen a sistemas binarios cerrados  

NASA Astrophysics Data System (ADS)

Stellar evolution in close binary systems (CBSs, those in which one or more mass transfer/mass loss episodes can occur) is a topic of great interest in Astronomy. The reason is that a large fraction of the stars belong to CBSs and this has originated our interest for the study of such systems. Based on the stellar evolution code for isolated stars developed in the Facultad de Ciencias Astronómicas y Geofísicas (UNLP) by Dr. O.G. Benvenuto, we have built a new code that can compute the evolution of stars members of CBSs. The version of the code we have employed in performing the calculations we show in this work, make a great advance in the study of this kind of systems, since the rate of mass loss is computed in an self-consistent fashion. For this purpose, we have incorporated in the code for isolated stars a new variable in the iterations: the rate of mass loss dot{M}. In addition, we need to compute a critical radius that discern if the star is lossing mass or not. Based on the experience of other authors we have defined the radius of the Roche lobe as a critical radius in such a way that if the stellar radius overflows this, mass loss will occur. On the other hand, if the stellar radius is smaller, the evolution proceeds as if the star were isolated. If all mass lost from a star is deposited on the surface of its companion, and total systemic energy is conserved we have a conservative case. However, we have included in our code effects of energy loss for ejection of matter from the system, and consider dissipative effects like gravitational radiation and magnetic braking. This considerations causes different results from conservative case. Inasmuch as, in view of the non conservation of total angular momentum, it is necessary to perform a careful calculation of the orbital evolution. We present the evolution of four primary stars (the initially more massive star in the systems) with the following characteristics: - Initial masses of 1.5 and 2 M?, initial period of 0.7 days, and initial mass ratio of 1.5. Case A (mass transfer begin during core hydrogen burning), non conservative. - Initial masses of 2 and 1.4 M?, initials periods of 1.5 and 1 days, initial mass ratios of 1.5 and 1, respectively. Case B (mass transfer begin during central contraction after central hydrogen exhaustion), non conservative. We have also shown the results obtained with a version of the code, in preparation, that performs the evolution for both stars belonging to a CBS simultaneously. It is a CBS in which the initial mass of the primary is 10 M?, the initial period of 6 days and the initial mass ratio of 1.25. Case B, conservative.

De Vito, M. A.; Benvenuto, O. G.


Spent sealed radium sources conditioning in Latin America  

SciTech Connect

The management of spent sealed sources is considered by the International Atomic Energy Agency (IAEA) one of the greatest challenges faced by nuclear authorities today, especially in developing countries. One of the Agency`s initiatives to tackle this problem is the Spent Radium Sources Conditioning Project, a worldwide project relying on the regional co-operation between countries. A team from the Brazilian nuclear research institute Centro de Desenvolvimento da Tecnologia Nuclear (CDTN) was chosen as the expert team to carry out the operations in Latin America; since December 1996 radium sources have been safely conditioned in Uruguay, Nicaragua, Guatemala, Ecuador and Paraguay. A Quality Assurance Program was established, encompassing the qualification of the capsule welding process, written operational procedures referring to all major steps of the operation, calibration of monitors and information retrievability. A 200L carbon steel drum-based packaging concept was used to condition the sources, its cavity being designed to receive the lead shield device containing stainless steel capsules with the radium sources. As a result of these operations, a total amount of 2,897 mg of needles, tubes, medical applicators, standard sources for calibration, lightning rods, secondary wastes and contaminated objects were stored in proper conditions and are now under control of the nuclear authorities of the visited countries.

Mourao, R.P. [Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, Minas Gerais (Brazil)



Strip Ionization Chamber as Beam Monitor in the Proton Therapy Eye Treatment  

NASA Astrophysics Data System (ADS)

Since spring 2002, ocular pathologies have been treated in Catania at the Centro di AdroTerapia e Applicazioni Nucleari Avanzate (CATANA) within a collaboration between INFN Laboratori Nazionali del Sud (LNS), Physics Department, Ophthalmology Institute, Radiology Institute of the Catania University and CSFNSM Catania. A beam line from a 62 MeV Superconducting Cyclotron is used to treat shallow tumors. The beam is conformed to the tumor shape with a passive delivery system. A detector system has been developed in collaboration with INFN-Torino to be used as real time beam monitor. The detector, placed upstream of the patient collimator, consists of two parallel plate ionization chambers with the anode segmented in strips. Each anode is made of 0.5 mm-wide 256 strips corresponding to (12.8 × 12.8) cm2 sensitive area. With the two strip ionization chambers one can measure the relevant beam parameters during treatment to probe both asymmetry and flatness. In the test carried out at CATANA the detector has been used under different and extreme beam conditions. Preliminary results are given for profiles and skewness, together with a comparison with reference detectors.

Marchetto, F.; Cirio, R.; Garella, M. A.; Giordanengo, S.; Boriano, A.; Givehchi, N.; La Rosa, A.; Peroni, C.; Donetti, M.; Bourhaleb, F.; Pitta', G.; Cirrone, G. A. P.; Cuttone, G.; Raffaele, L.; Sabini, M. G.; Valastro, L.



Inorganic pigment study of the San Pedro Gonzalez Telmo Sibyls using total reflection X-ray fluorescence  

NASA Astrophysics Data System (ADS)

This article describes the study carried out on a series of oil paintings on canvas from the eighteenth century that were restored at Centro de Producción e Investigación en Restauración y Conservación Artística y Bibliográfica - Tarea (CEIRCAB-Tarea), Buenos Aires, Argentina: the San Pedro González Telmo Sibyls. Experimental study was undertaken to identify inorganic pigments and the technique used in their confection; and, in this way, try to add information about their local origin. Therefore special emphasis was put to infer technologies used in the manufacturing of these paintings. Elemental analysis was performed by total reflection X-ray fluorescence spectrometry (TXRF) and complemented by optical and polarized light microscopy. Microsampling was carefully done over areas of the paintings which were damaged and where a small additional loss will not be noticed. This investigation has shown that a variety of pigments were used, namely earth pigments (red and yellow ochres), white lead, vermilion, etc., and they were used either pure or in mixtures. This characterization helped conservators in their decisions regarding a better understanding of the deterioration processes. In addition, this research about the material composition allowed the art historians and restorers the possibility to obtain information about where, when or by whom The San Pedro González Telmo Sibyls may have been painted.

Vázquez, Cristina; Custo, Graciela; Barrio, Néstor; Burucúa, José; Boeykens, Susana; Marte, Fernando



Synthesis, growth and spectral studies of S-benzyl isothiouronium nitrate by density functional methods.  


S-benzyl isothiouronium nitrate (SBTN), was synthesized and characterized by X-ray diffraction, FTIR, UV-Vis and NMR spectra. The Centro-symmetric single crystal of S-benzyl isothiouronium nitrate (SBTN), which crystallizes in monoclinic crystal system with space group P21/C, exhibits second order non-linear optical (NLO) susceptibility, due to intermolecular charge transfer. S-benzyl isothiouronium ion forms well defined charge transfer (CT) salt with anion nitrate through N-H···O and C-H···O hydrogen bonds. It is to identify the direction of specific N-H···O hydrogen bond between the -NH2 group and O(-) in the anion and also sacking in the solid state responsible for NLO activity in this crystal. The SHG technique confirms the non-linear optical property of the grown crystals. Density functional theory (DFT) calculation has been carried out to study the nature of hydrogen involved in the SBTN crystal. The bond lengths and bond angles of the structure of SBTN crystal calculated using B3LYP method with 6-311+(2d,2p) basis set. These calculations are compared with experimental values to provide deep insight into its electronic structure and property of grown crystal. PMID:23501710

Hemalatha, P; Kumaresan, S; Veeravazhuthi, V; Gunasekaran, S



IBA analysis of a laser cleaned archaeological metal object: The San Esteban de Gormaz cross (Soria-Spain)  

NASA Astrophysics Data System (ADS)

The object under study, a 12th century gilded copper cross with a wooden core, now almost disappeared, shows the typical features produced by a long burial time: the entire surface of the copper alloys is covered by several layers of degradation products, which hinder the "legibility" of the cross in terms of the original materials and manufacturing techniques employed. In its cleaning several techniques have been applied and compared (dry and wet laser ablation, mechanical ablation, ultrasound brush). In the intermediate cleaning phase the cross has been extensively analysed with the external proton micro-beam of the Centro de Micro-Análisis de Materiales (CMAM) of the Universidad Autónoma de Madrid. PIXE and RBS techniques have been used in parallel, to asses both the chemical composition and the layered structure of cleaned and original parts with the aim of verifying that none of the object structural features are being modified by the cleaning process leaving intact the possibility of artistic interpretation of the object (e.g. small series production of the cross elements). The recovery of this exceptional ornamental object is made possible by the coordinated work of several professionals coming from various disciplines and aimed at establishing the importance of this cross in terms of its physical appearance and in terms of the manufacturing techniques.

Zucchiatti, A.; Gutiérrez Neira, P. C.; Climent-Font, A.; Escudero, C.; Barrera, M.



Synthesis, growth and spectral studies of S-benzyl isothiouronium nitrate by density functional methods  

NASA Astrophysics Data System (ADS)

S-benzyl isothiouronium nitrate (SBTN), was synthesized and characterized by X-ray diffraction, FTIR, UV-Vis and NMR spectra. The Centro-symmetric single crystal of S-benzyl isothiouronium nitrate (SBTN), which crystallizes in monoclinic crystal system with space group P21/C, exhibits second order non-linear optical (NLO) susceptibility, due to intermolecular charge transfer. S-benzyl isothiouronium ion forms well defined charge transfer (CT) salt with anion nitrate through N-H⋯O and C-H⋯O hydrogen bonds. It is to identify the direction of specific N-H⋯O hydrogen bond between the -NH2 group and O- in the anion and also sacking in the solid state responsible for NLO activity in this crystal. The SHG technique confirms the non-linear optical property of the grown crystals. Density functional theory (DFT) calculation has been carried out to study the nature of hydrogen involved in the SBTN crystal. The bond lengths and bond angles of the structure of SBTN crystal calculated using B3LYP method with 6-311+(2d,2p) basis set. These calculations are compared with experimental values to provide deep insight into its electronic structure and property of grown crystal.

Hemalatha, P.; Kumaresan, S.; Veeravazhuthi, V.; Gunasekaran, S.



Nyssomyia intermedia (Lutz & Neiva, 1912) and Nyssomyia neivai (Pinto, 1926) (Diptera: Psychodidae: Phlebotominae) geographical distribution and epidemiological importance.  


Nyssomyia intermedia (Lutz & Neiva 1912) and N. neivai (Pinto 1926) are possible vectors of tegumentary leishmaniasis in some regions of Brazil. Further, the latter was until recently, considered a junior synonym of the former. This study has the purpose of updating our knowledge of the geographical distribution of these species, based on specimens deposited at the collection of the Centro de Pesquisas René Rachou-Fiocruz, Faculdade de Saúde Pública-Universidade de São Paulo, and on data presented by literature as also to associate this distribution with the cutaneous leishmaniasis cases reported. It has been reported that N. intermedia occurs in the states of the Northeastern Region, in Rio de Janeiro, Espírito Santo, on the northern coast of São Paulo, in eastern Minas Gerais, Mato Grosso do Sul, and Goiás, close to the border with Minas Gerais and Bahia. N. neivai occurs in the Southern Region, southern coast and in western São Paulo, southern and western Minas Gerais, southern Goiás, and southern Pará, beyond Argentina, Bolivia, and Paraguay. It is important to highlight that N. intermedia and N. neivai occur in sympatry in Minas Gerais and São Paulo. N. intermedia or N. neivai are predominant or are captured abundantly in several cutaneous leishmaniasis foci in the Southeastern and Southern regions of Brazil. PMID:17612769

Andrade Filho, José Dilermando; Galati, Eunice A Bianchi; Falcão, Alda Lima



Characterization of regional transport and dispersion using Project MOHAVE tracer data.  


Perfluorocarbon tracers were released continuously from several surface locations and one power plant stack location during the winter (30 days) and summer (50 days) intensive studies as part of Project MOHAVE. Tracers were released in winter from the Mohave Power Plant (MPP) and Dangling Rope, UT, located on the shore of Lake Powell near Page, AZ; and in summer from MPP, the Tehachapi Pass between the Mojave Desert and the Central Valley in California, and El Centro, CA, on the California-Mexico border. At the Tehachapi tracer release site six-hour pulses of a separately identifiable perfluorocarbon tracer were released every four days in order to assess the time for the tracer to clear the monitoring network. Daily 24-hr integrated samples were collected at about 30 sites in four states. Limited tracer concentration data with higher time resolution is also available. Graphical displays and analyses identify several regional transport paths, including a convergence zone in the Mojave Desert, the importance of terrain channeling, especially in winter, and a relationship between 24-hr maximum influence function and distance that may prove useful as a scoping tool and to test regional scale air quality models. In winter, Dangling Rope tracer was routinely transported through the entire length of the Grand Canyon, while in summer, MPP tracer was routinely transported over most of Lake Mead. PMID:10842938

Pitchford, M; Green, M; Kuhns, H; Farber, R J



Organic non-linear optics and opto-electronics  

NASA Astrophysics Data System (ADS)

?-conjugated organic molecules and polymers are of great importance in physics, chemistry, material science and engineering. It is expected that, in the near future, organic materials will find widespread use in many technological applications. In the case of organic opto-electronic systems, the list of devices includes light emitting diodes (OLEDs), photovoltaic cells (OPVs), field-effect transistors (OFET), photorefractive materials for light manipulation, among others. These materials are also used for photonic applications: all-optical switching, modulators, optical correlators, plastic waveguides, all polymeric integrated circuits, solid-state lasers, and for biophotonic applications as in the case of the development of organic labels for multiphoton microscopy and photodynamic therapy. The advances in the developing of organic compounds with better mechanical, electrical, and optical (linear and non-linear) characteristics are of a great importance for this field. Here, we present the research on this area carried out at the Centro de Investigaciones en Óp-tica (CIO), in collaboration with Chemistry Departments of different institutions. This work focuses on the optical characterization of materials through several techniques such as TOF, FWM, TBC, THG Maker Fringes, HRS, Z-scan, and TPEF. Additionally, some applications, such as dynamic holography by using photorefractive polymers, and OPVs cells will be discussed.

Maldonado, J. L.; Ramos-Ortíz, G.; Rodríguez, M.; Meneses-Nava, M. A.; Barbosa-García, O.; Santillán, R.; Farfán, N.



Effects of Pre-Encoding Stress on Brain Correlates Associated with the Long-Term Memory for Emotional Scenes  

PubMed Central

Recent animal and human research indicates that stress around the time of encoding enhances long-term memory for emotionally arousing events but neural evidence remains unclear. In the present study we used the ERP old/new effect to investigate brain dynamics underlying the long-term effects of acute pre-encoding stress on memory for emotional and neutral scenes. Participants were exposed either to the Socially Evaluated Cold Pressure Test (SECPT) or a warm water control procedure before viewing 30 unpleasant, 30 neutral and 30 pleasant pictures. Two weeks after encoding, recognition memory was tested using 90 old and 90 new pictures. Emotional pictures were better recognized than neutral pictures in both groups and related to an enhanced centro-parietal ERP old/new difference (400–800 ms) during recognition, which suggests better recollection. Most interestingly, pre-encoding stress exposure specifically increased the ERP old/new-effect for emotional (unpleasant) pictures, but not for neutral pictures. These enhanced ERP/old new differences for emotional (unpleasant) scenes were particularly pronounced for those participants who reported high levels of stress during the SECPT. The results suggest that acute pre-encoding stress specifically strengthens brain signals of emotional memories, substantiating a facilitating role of stress on memory for emotional scenes.

Wirkner, Janine; Weymar, Mathias; Low, Andreas; Hamm, Alfons O.



Observatorio Astronómico De Cantabria  

NASA Astrophysics Data System (ADS)

The Astronomical Observatory of Cantabria is a center of the Consejería de Medio Ambiente del Gobierno de Cantabria managed by the Centro de Investigación del Medio Ambiente (CIMA), an autonomous organism which depends on such Consejería. The development of different activities of the Observatory is a joint collaboration between the University of Cantabria and the Agrupación Astronómica Cántabra (AstroCantabria). As part of the University of Cantabria, the Instituto de Física de Cantabria (IFCA, CSIC-UC) is in charge of the direction, management and coordination of scientific, observational, educational and outreach activities of the Observatory. AstroCantabria takes care of the outreach activities for the general public as well as the astronomical observations. In addition, it is responsible for the calibration and maintenance of the astronomical instrumentation of the Observatory. The Astronomical Observatory of Cantabria is located on the Southern edge of the Comunidad Autónoma de Cantabria, on the high plateau of La Lora (Valderredible county), at an altitude of 1,080m, with longitude 3? 56 ' 36' W and latitude 42? 46 ' 18' N. Rocamundo is the closest town. The Observatory aims to become a center of reference for scientific, observational, educational and public outreach activities in Cantabria. In the near future, an observational proposal system for outside users will be set in place.

Domínguez, R. M.; Carrera, F. J.


Effects of pre-encoding stress on brain correlates associated with the long-term memory for emotional scenes.  


Recent animal and human research indicates that stress around the time of encoding enhances long-term memory for emotionally arousing events but neural evidence remains unclear. In the present study we used the ERP old/new effect to investigate brain dynamics underlying the long-term effects of acute pre-encoding stress on memory for emotional and neutral scenes. Participants were exposed either to the Socially Evaluated Cold Pressure Test (SECPT) or a warm water control procedure before viewing 30 unpleasant, 30 neutral and 30 pleasant pictures. Two weeks after encoding, recognition memory was tested using 90 old and 90 new pictures. Emotional pictures were better recognized than neutral pictures in both groups and related to an enhanced centro-parietal ERP old/new difference (400-800 ms) during recognition, which suggests better recollection. Most interestingly, pre-encoding stress exposure specifically increased the ERP old/new-effect for emotional (unpleasant) pictures, but not for neutral pictures. These enhanced ERP/old new differences for emotional (unpleasant) scenes were particularly pronounced for those participants who reported high levels of stress during the SECPT. The results suggest that acute pre-encoding stress specifically strengthens brain signals of emotional memories, substantiating a facilitating role of stress on memory for emotional scenes. PMID:24039697

Wirkner, Janine; Weymar, Mathias; Löw, Andreas; Hamm, Alfons O



Universe Awareness . An inspirational programme for economically disadvantaged young children.  

NASA Astrophysics Data System (ADS)

The beauty of the sky and its connection with the human development have inspired generations with wonder. Astronomy conveys the excitement of science to the public. Considerable resources are devoted to outreach in developed countries, with spectacular images produced by modern astronomical facilities and astronomical discoveries that change our views of the Universe. Universe Awareness (UNAWE) is a programme for children between 4 and 10 years old. The formative ages of 4 to 10 years are crucial in child development. Children of that age can appreciate the beauty of astronomical objects and develop a ``feeling'' for the vastness of the Universe. Exposing young children to such material is likely to broaden their minds and stimulate their world-view. The programme concentrates on economically disadvantaged young children because most other children will be exposed to some knowledge about the Universe and disparities between advantaged and disadvantaged children increase with age. Venezuela hosted a successful pilot project in 2006. From spontaneous observation of the sky to a teacher-training workshop in the "Centro de Investigaciones de Astronomía" in Mérida, this was a wonderful experience for participants and organisers alike. This shows how successful the UNAWE programme can be.

Ödman, C. J.; Scorza, C.; Miley, G. K.; Madsen, C.


Few Skewed Results from IOTA Interferometer YSO Disk Survey  

NASA Astrophysics Data System (ADS)

The 3-telescope IOTA interferometer is capable of measuring closure phases for dozens of Herbig Ae/Be stars in the near-infrared. The closure phase unambiguously identifies deviations from centro-symmetry (i.e., skew) in the brightness distribution, at the scale of 4 milliarcseconds (sub-AU physical scales) for our work. Indeed, hot dust emission from the inner circumstellar accretion disk is expected to be skewed for (generic) flared disks viewed at intermediate inclination angles, as has been observed for LkHa 101. Surprisingly, we find very little evidence for skewed disk emission in our IOTA3 sample, setting strong constraints on the geometry of the inner disk. In particular, we rule out the currently-popular model of a VERTICAL hot inner wall of dust at the sublimation radius. Instead, our data is more consistent with a curved inner wall that bends away from the midplane as might be expected from the pressure-dependence of dust sublimation or limited absorption of stellar luminosity in the disk midplane by gas.

Monnier, J. D.; Millan-Gabet, R.; Berger, J.-P.; Pedretti, E.; Traub, W.; Schloerb, F. P.



Time-Resolved X-Ray Magnetic Circular Dichroism - A Selective Probe of Magnetization Dynamics on Nanosecond Timescales  

NASA Astrophysics Data System (ADS)

Many synchrotron radiation techniques have been developed in the last 15 years for studying the magnetic properties of thin-film materials. The most attractive properties of synchrotron radiation are its energy tunability and its time structure. The first property allows measurements in resonant conditions at an absorption edge of each of the magnetic elements constituting the probed sample, and the latter allows time-resolved measurements on subnanosecond timescales. In this review, we introduce some of the synchrotron-based techniques used for magnetic investigations. We then describe in detail X-ray magnetic circular dichroism (XMCD) and how time-resolved XMCD studies can be carried out in the pump-probe mode. Finally, we illustrate some applications to magnetization reversal dynamics in spin valves and tunnel junctions, using fast magnetic field pulses applied along the easy magnetization axis of the samples. Thanks to the element-selectivity of X-ray absorption spectroscopy, the magnetization dynamics of the soft (Permalloy) and the hard (cobalt) layers can be studied independently. In the case of spin valves, this allowed us to show that two magnetic layers that are strongly coupled in a static regime can become uncoupled on nanosecond timescales.Present address: Universidade Federal do Paraná, Centro Politécnico CP 19011, Curitiba - PR CEP 81531-990, Brazil

Pizzini, Stefania; Vogel, Jan; Bonfim, Marlio; Fontaine, Alain


A comparative clinical trial of Norinyl 1/35 versus Brevicon in Rio Clara, Brazil.  


A comparative clinical trial of two combined oral contraceptives (OCs) with equivalent estrogen content, but different amounts of progestogens, was conducted at the Centro Medico Especializado em Planejamento Familiar in Rio Clara, Brazil. The study was designed to determine the differences in discontinuation rates between Norinyl 1/35 (Syntex) and Brevicon (Syntex) as well as the frequency of selected side effects which might contribute to method discontinuation. Both OCs contain 0.035 mg of ethinyl estradiol; Brevicon contains 0.5 mg and Norinyl 1/35 contains 1 mg norethindrone. Three-hundred women enrolled in the study were randomly assigned to either the Norinyl 1/35 or Brevicon OCs and follow-up visits were scheduled at 1, 4, 8 and 12 months after admission. Intermenstrual bleeding was reported by significantly more women in the Brevicon group than in the Norinyl group (p less than 0.05), and significantly more Brevicon users reported an increase in intermenstrual bleeding. At the end of the study period, no differences were found between the two OC groups in terms of discontinuation rates, but a large number of women in each group discontinued for menstrual problems. The total discontinuation rates at 11 months for both groups were extremely high: 68.2 for the Norinyl 1/35 group and 75.2 for the Brevicon users. The largest group of discontinuations were comprised of those discontinuing for menstrual problems, other personal reasons, planned pregnancy and side effects. PMID:3058383

Albuquerque, L A; Albuquerque, E G; Waszak, C S; Rowan, A J; Barthlow, D



EEG reveals an early influence of social conformity on visual processing in group pressure situations.  


Humans are social beings and often have to perceive and perform within groups. In conflict situations, this puts them under pressure to either adhere to the group opinion or to risk controversy with the group. Psychological experiments have demonstrated that study participants adapt to erroneous group opinions in visual perception tasks, which they can easily solve correctly when performing on their own. Until this point, however, it is unclear whether this phenomenon of social conformity influences early stages of perception that might not even reach awareness or later stages of conscious decision-making. Using electroencephalography, this study has revealed that social conformity to the wrong group opinion resulted in a decrease of the posterior-lateral P1 in line with a decrease of the later centro-parietal P3. These results suggest that group pressure situations impact early unconscious visual perceptual processing, which results in a later diminished stimulus discrimination and an adaptation even to the wrong group opinion. These findings might have important implications for understanding social behavior in group settings and are discussed within the framework of social influence on eyewitness testimony. PMID:23163969

Trautmann-Lengsfeld, Sina Alexa; Herrmann, Christoph Siegfried



[Kidney transplant from living donors in children?].  


A living-donor kidney transplant offers a child at the terminal stages of renal disease better functional recovery and quality of life than an organ from a deceased donor. Before starting the procedure for a living-donor transplant, however, it is necessary to establish if it is really safe. There are diseases, such as focal segmental glomerulosclerosis, atypical HUS and membranoproliferative glomerulonephritis with dense deposits, for which living donation is not recommended given the high incidence of recurrence of the disease but also the frequent loss of the graft. Regarding the selection of the donor, an increased risk of acute rejection has been reported for donors older than 60-65 years and a worsening of the renal outcome if the donor's weight is equal to or less than the recipient's. Finally, it is necessary to take into consideration that complications may arise in the donor both in the perioperative period and in the long term. In conclusion, kidney transplant from a living donor is a natural choice within the pediatric setting. The parents, usually young and highly motivated to donate, are the ideal donors. However, although the risks associated with donation are minimal, they are not totally absent, and consequently it is mandatory to follow standardized procedures according to the guidelines issued by the Centro Nazionale Trapianti. PMID:21341241

Ginevri, Fabrizio; Dello Strologo, Luca; Guzzo, Isabella; Belingheri, Mirco; Ghio, Luciana


Multiwavelength Optical Observations of Two Chromospherically Active Binary Systems: V789 Mon and GZ Leo  

NASA Astrophysics Data System (ADS)

This paper describes a multiwavelength optical study of chromospheres in two X-ray/EUV-selected active binary stars with strong H? emission, V789 Mon (2RE J0725 - 002) and GZ Leo (2RE J1101+223). The goal of the study is to determine radial velocities and fundamental stellar parameters in chromospherically active binary systems in order to include them in the activity-rotation and activity-age relations. We carried out high-resolution echelle spectroscopic observations and applied spectral-subtraction technique in order to measure emission excesses due to chromosphere. The detailed study of activity indicators allowed us to characterize the presence of different chromospheric features in these systems and enabled to include them in a larger activity-rotation survey. We computed radial velocities of the systems using cross-correlation with the radial velocity standards. The double-line spectral binarity was confirmed and the orbital solutions improved for both systems. In addition, other stellar parameters such as spectral types, projected rotational velocities (vsin i) and the equivalent width of the lithium Li I ?6707.8 Å absorption line were determined. Based on observations collected with the 2.2 m telescope at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto (Almería, Spain), operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC) and with the 2.1 m Otto Struve Telescope at McDonald Observatory of the University of Texas at Austin (USA).

Gálvez, M. C.; Montes, D.; Fernández-Figueroa, M. J.; De Castro, E.; Cornide, M.



Seismic Responses of Shot Span Bridge under Three Different Patterns of Earthquake Excitations  

SciTech Connect

This paper presents a study of the influence of three different types of seismic input methods on the longitudinal seismic response of a short, three-span, variable cross-section, reinforced concrete bridge. Research progress of the seismic model is introduced briefly. Finite element model is created for the bridge and time history analysis conducted. Three different types of illustrative excitations are considered: 1) the EI-Centro seismic wave is used as uniform excitations at all bridge supports; 2) fixed apparent wave velocity is used for response analysis of traveling wave excitations on the bridge; 3) conforming to a selected coherency model, the multiple seismic excitation time histories considering spatially variable effects are generated. The contrast study of the response analysis result under the three different seismic excitations is conducted and the influence of different seismic input methods is studied. The comparative analysis of the bridge model shows that the uniform ground motion input can not provide conservative seismic demands-in a number of cases it results in lower response than that predicted by multiple seismic excitations. The result of uniform excitation and traveling wave excitation shows very small difference. Consequently, multiple seismic excitations needs to be applied at the bridge supports for response analysis of short span bridge.

Zhou Daochuan; Chen Guorong [Department of Civil Engineering, Hohai University, Nanjing 210098 (China); Lu Yan [School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou, 450001 (China)



AZTECA, a y-y diagram oriented interactive computer program for optical system design and optimization  

NASA Astrophysics Data System (ADS)

The Centro de Investigaciones en Optica is developing the AZTECA optical design program to exploit the full synthesis capabilities intrinsic to Delano's y-y method. Both the y- y diagram and its dual the (omega) -(omega) diagram, are manipulated in real time to introduce changes at any point or line in those diagrams. These changes result in altered new versions of the optical system by means of a specialized subroutine that incorporates the fundamental synthesis equations for those diagrams. To display results on the computer's screen as the optimization process progress, AZTECA makes wide use of the fact that the y-y and the (omega) -(omega) diagrams display graphically all the first order attributes of an optical system. This program adjoins to these features the calculation of Buchdahl's 3rd, 5th, and 7th order aberration coefficients to the output. This results in a real time display of the system's paraxial and aberrational behavior. Efficient graphic displays, the program's modular structure and an interactive mode of operation, also contribute to make the AZTECA a versatile platform. It will be further developed as a new tool for efficient optical system design.

Flores-Hernandez, Ricardo



Vibration control of hysteretic systems via neural network adaptive backstepping  

NASA Astrophysics Data System (ADS)

In this paper, an intelligent control methodology is proposed to mitigate earthquake vibrations in a building. The structure object of study is a 10-story building whose base is isolated by means of a passive actuator and an MR damper. The system has uncertain parameters and nonmeasurable variables that must be accounted for in order to gain good control performance. Besides, the system is subject to unknown perturbations (incoming earthquakes). An adaptive backstepping controller is designed to generate the actuator control signal based on the base velocity and displacement measurements as well as on the dynamics of the base isolation system. Uncertainty in structure stiffness and damping coefficients are compensated by parameter adaptation. The MR damper can be modeled by the well known Bouc-Wen model. However, this model contains an unmeasurable variable, z, that describes the hysteretic behavior, so it must be estimated. A neural network approximator is proposed to estimate the unmeasurable variable. This way, the hysteresis effect is modeled by the neural network. The control performance is verified by simulations performed in MATLAB/Simulink using common earthquakes such as those of El Centro and Taft.

Zapateiro, Mauricio; Luo, Ningsu



Solar central receiver reformer system for ammonia plants  

NASA Astrophysics Data System (ADS)

Details of the conceptual design, economic analysis, and development plan for a solar central receiver system for retrofitting the Valley Nitrogen Producers, Inc., El Centro, California 600 ST/SD Ammonia Plant are presented. The retrofit system consists of a solar central receiver reformer (SCRR) operating in parallel with the existing fossil fired reformer. Steam and hydrocarbon react in the catalyst filled tubes of the inner cavity receiver to form a hydrogen rich mixture which is the syngas feed for the ammonia production. The SCRR system displaces natural gas presently used in the fossil reformer combustion chamber. The solar reformer retrofit system characteristics and its interface with the existing plant are simple, incorporating state of the art components with proven technology. A northfield composed of one thousand forty second generation heliostats provides solar energy to the receiver which is positioned on top of a 90 meter high steel tower. The overall economics of this system can provide over 20% discount cash flow rate of return with proper investment and market conditions.



LENS (lithography enhancement toward nano scale): a European project to support double exposure and double patterning technology development  

NASA Astrophysics Data System (ADS)

In 2009 a new European initiative on Double Patterning and Double Exposure lithography process development was started in the framework of the ENIAC Joint Undertaking. The project, named LENS (Lithography Enhancement Towards Nano Scale), involves twelve companies from five different European Countries (Italy, Netherlands, France, Belgium Spain) and includes: IC makers (Numonyx and STMicroelectronics), a group of equipment and materials companies (ASML, Lam Research srl, JSR, FEI), a mask maker (Dai Nippon Photomask Europe), an EDA company (Mentor Graphics) and four research and development institutes (CEA-Leti, IMEC, Centro Nacional de Microelectrónica, CIDETEC). The LENS project aims to develop and integrate the overall infrastructure required to reach patterning resolutions required by 32nm and 22nm technology nodes through the double patterning and pitch doubling technologies on existing conventional immersion exposure tools, with the purpose to allow the timely development of 32nm and 22nm technology nodes for memories and logic devices, providing a safe alternative to EUV, Higher Refraction Index Fluids Immersion Lithography and maskless lithography, which appear to be still far from maturity. The project will cover the whole lithography supply chain including design, masks, materials, exposure tools, process integration, metrology and its final objective is the demonstration of 22nm node patterning on available 1.35 NA immersion tools on high complexity mask set.

Cantu, Pietro; Baldi, Livio; Piacentini, Paolo; Sytsma, Joost; Le Gratiet, Bertrand; Guagiran, Stéphanie; Wong, Patrick; Miyashita, Hiroyuki; Atzei, Luisa R.; Buch, Xavier; Verkleij, Dick; Toublan, Olivier; Perez-Murano, Francesco; Mecerreyes, David



Measurement of 239Pu in urine samples at ultra-trace levels using a 1 MV compact AMS system  

NASA Astrophysics Data System (ADS)

Routine bioassay monitoring of Pu intake in exposed workers of research and nuclear industry is usually performed by alpha spectrometry. This technique involves large sample volumes of urine and time-consuming preparative and counting protocols. Compact accelerator mass spectrometry (AMS) facilities make feasible the determination of ultra low-level Pu activity concentrations and Pu isotopic ratios in biological samples (blood, urine and feces), being a rapid and cost-effective measurement technique. The plutonium results in urine samples presented here have been obtained on the 1 MV compact AMS system sited at the Centro Nacional de Aceleradores (CNA), in Seville, Spain. In this work, a different methodological approach has been developed alternative to the “classical” preparation of urine samples for alpha spectrometry. The procedure avoids the Pu precipitation step, and involves acid sample evaporation and acid digestion in a microwave oven. Finally, purification of plutonium was achieved by using chromatography columns filled up with BioRad AG1X2 anion exchange resin (Bio-Rad Laboratories Inc.). The total time needed for analysis is about 10 h, unlike the “classical” methods based on alpha spectrometry which need about 1 week. At present, it has been demonstrated that this method allows quantifying 239Pu activity concentrations in urine of, at least, 30 ?Bq (13 fg 239Pu). We can conclude that the procedure would be suitable to perform in vitro routine bioassay measurements. Moreover, the innovative application of AMS opens new and interesting analytical alternatives in this field.

Hernández-Mendoza, H.; Chamizo, E.; Yllera, A.; García-León, M.; Delgado, A.



Clostridium difficile-associated diarrhea in an ocelot (Leopardus pardalis).  


The aim of this study is to report a case of Clostridium difficile-associated diarrhea in an ocelot (Leopardus pardalis) in the state of Mato Grosso do Sul, Brazil. The animal, a 24-month-old male, was referred to the Centro de Reabilitação de Animais Silvestres (CRAS) with a history of having been run over and tibia and fibula fractures. After a surgery to repair the fractures, the ocelot underwent antibiotic therapy with two doses of sodium cefovecin, during which he presented with diarrhea. A stool sample was positive for A/B toxins by a cytotoxicity assay, and a toxigenic strain of C. difficile was isolated. No other enteropathogens were detected. The association between the history, clinical signs and laboratory exams confirmed the diagnosis of C. difficile-associated diarrhea. The present report confirms C. difficile as a potential pathogen for wild felids and suggests that the C. difficile-associated diarrhea should be considered in diarrhea cases, especially when the clinical signs began after antimicrobial use. PMID:23467074

Silva, Rodrigo Otávio Silveira; D'elia, Mirella Lauria; de Magalhães Soares, Danielle Ferreira; Cavalcanti, Álvaro Roberto; Leal, Rodrigo Costa; Cavalcanti, Guilherme; Pereira, Pedro Lúcio Lithg; Lobato, Francisco Carlos Faria



Electrophysiological correlates of biological motion permanence in humans.  


Spatiotemporal discontinuity of visual input is a common occurrence in daily life. For example, when a walking person disappears temporarily behind a wall, observers have a clear sense of his physical presence despite the absence of any visual information (movement permanence). To investigate the neural substrates of biological motion permanence, we recorded scalp EEG activity of sixteen subjects while they passively observed either biological or scrambled motion disappearing behind an occluder and reappearing. The moment of the occluder's appearance was either fixed or randomized. The statistical comparison between the biological and scrambled motion ERP waveforms revealed a modulation of activity in centro-parietal and right occipito-temporal regions during the occlusion phase when the biological motion disappearance was time-locked, possibly reflecting the recall of sensorimotor representations. These representations might allow the prediction of moving organisms in occlusion conditions. When the appearance of the occluder was unpredictable there was no difference between biological and scrambled motion either before or during occlusion, indicating that temporal prediction is relevant to the processing of biological motion permanence. PMID:22964139

Saunier, Ghislain; Martins, Eduardo F; Dias, Elisa C; de Oliveira, José M; Pozzo, Thierry; Vargas, Claudia D



Stress sensitizes the brain: increased processing of unpleasant pictures after exposure to acute stress.  


A key component of acute stress is a surge in vigilance that enables a prioritized processing of highly salient information to promote the organism's survival. In this study, we investigated the neural effects of acute stress on emotional picture processing. ERPs were measured during a deep encoding task, in which 40 male participants categorized 50 unpleasant and 50 neutral pictures according to arousal and valence. Before picture encoding, participants were subjected either to the Socially Evaluated Cold Pressor Test (SECPT) or to a warm water control procedure. The exposure to the SECPT resulted in increased subjective and autonomic (heart rate and blood pressure) stress responses relative to the control condition. Viewing of unpleasant relative to neutral pictures evoked enhanced late positive potentials (LPPs) over centro-parietal scalp sites around 400 msec after picture onset. Prior exposure to acute stress selectively increased the LPPs for unpleasant pictures. Moreover, the LPP magnitude for unpleasant pictures following the SECPT was positively associated with incidental free recall performance 24 hr later. The present results suggest that acute stress sensitizes the brain for increased processing of cues in the environment, particularly priming the processing of unpleasant cues. This increased processing is related to later long-term memory performance. PMID:22185496

Weymar, Mathias; Schwabe, Lars; Löw, Andreas; Hamm, Alfons O



Footnotes to History: The Nations You Didn't Learn About in High School Geography  

NSDL National Science Digital Library

Recognizing the nation-state as an arbitrary, recent, and rather fluid concept, James Erwin has created a site that "provides an overview of ephemeral states, micronations, secessionist states, and every other kind of country you never heard of in high school -- from Maryland in Africa to the Republic of West Florida to the Centro-Caspian Dictatorship." The site contains an alphabetical index that consists of short, encyclopedia-like entries on thousands of different entities that have existed or continue to exist in the face of the hegemony of modern nationhood. In a time when the cartographers can not keep up with the redrawn lines of the world's maps from Eastern Europe to Africa to the Middle East, Erwin's online guide serves as a useful reference to those alternative identifications which have demonstrated a surprising resiliency in the post-cold war era. The site features a comprehensive bibliography of Erwin's sources as well as a brief annotated list of related links, particularly to the Websites of little-known micronations.



EEG amplitude spectra before near threshold visual presentations differentially predict detection/omission and short-long reaction time outcomes.  


Performance in simple stimulus detection manifests as both probability of detection and speed of signaling detected stimuli. These two dimensions of performance across trials were examined with respect to brain states just prior to stimulus delivery, using near threshold stimuli targeting the magnocellular or the parvocellular visual streams in an attempt to isolate differential perceptual preparation. The EEG amplitude of 12 university students was analyzed in spectral bands from 2 to 50 Hz at 9 bilateral channel pairs in a window covering -450 ms to +50 ms relative to stimulus onset. A hierarchical statistical procedure was applied to control false positive results. EEG power in the 2, 4, 8 and 10 Hz bands was found significantly lower at the F7-F8 channel pair both before detected compared to omitted stimuli and before the fastest compared to slowest reaction time quartiles, with no stimulus type effect. In addition, the 22 and 24 Hz band activity was lower prior to better performance frontally (F3-F4, F7-F8) in reaction time but not in detection, while it was larger centro-parietally (CP1-CP2, P3-P4) in detection but not in reaction times. Spectral analysis thus shows stimulus detection and response speed to depend partly on common and partly on distinct pre-stimulus brain states. PMID:23747426

Achim, André; Bouchard, Julie; Braun, Claude M J



The late positive potential, emotion and apathy in Parkinson's disease.  


Parkinson's disease is associated with emotional changes including depression, apathy, and anxiety. The current study investigated emotional processing in non-demented individuals with Parkinson disease (PD) using an electrophysiological measure, the centro-parietal late positive potential (LPP). Non-demented patients with Parkinson's disease (n=17) and healthy control participants (n=16) viewed pleasant, neutral, and unpleasant pictures while EEG was recorded from a 64-channel geodesic net. The Parkinson patients did not differ from controls in terms of early electrophysiological components that index perceptual processing (occipital P100, N150, P250). Parkinson patients, however, showed reduced LPP amplitude specifically when viewing unpleasant, compared to pleasant, pictures as well as when compared to controls, consistent with previous studies suggesting a specific difference in aversive processing between PD patients and healthy controls. Importantly, LPP amplitude during unpleasant picture viewing was most attenuated for patients reporting high apathy. The data suggest that apathy in PD may be related to a deficit in defensive activation, and may be indexed cortically using event-related potentials. PMID:23320979

Dietz, J; Bradley, M M; Jones, J; Okun, M S; Perlstein, W M; Bowers, D



The neural oscillations of conflict adaptation in the human frontal region.  


Incongruency between print color and the semantic meaning of a word in a classical Stroop task activates the human conflict monitoring system and triggers a behavioral conflict. Conflict adaptation has been suggested to mediate the cortical processing of neural oscillations in such a conflict situation. However, the basic mechanisms that underlie the influence of conflict adaptation on the changes of neural oscillations are not clear. In the present study, electroencephalography (EEG) data were recorded from sixteen healthy human participants while they were performing a color-word Stroop task within a novel look-to-do transition design that included two response modalities. In the 'look' condition, participants were informed to look at the color of presented words but no responses were required; in the 'do' condition, they were informed to make arranged responses to the color of presented words. Behaviorally, a reliable conflict adaptation was observed. Time-frequency analysis revealed that (1) in the 'look' condition, theta-band activity in the left- and right-frontal regions reflected a conflict-related process at a response inhibition level; and (2) in the 'do' condition, both theta-band activity in the left-frontal region and alpha-band activity in the left-, right-, and centro-frontal regions reflected a process of conflict control, which triggered neural and behavioral adaptation. Taken together, these results suggest that there are frontal mechanisms involving neural oscillations that can mediate response inhibition processes and control behavioral conflict. PMID:23570676

Tang, Dandan; Hu, Li; Chen, Antao



Progesterone and Estrogen Receptors in Neurofibromas of Patients with NF1  

PubMed Central

Summary: Neurofibromatosis type 1 (NF1) or von Recklinghausen disease is a genetic disorder affecting the growth of cells in nervous system. One of the most remarkable characteristics of this disease is the development of benign tumors of the nervous system (neurofibromas). The purpose of this study was to test tissue samples taken from neurofibromas and plexiform neurofibromas of NF1 patients for the presence of estrogen and progesterone receptors. We used previously collected samples from patients registered in the database of the Centro Nacional de Neurofibromatose (CNNF-Brazil). Samples from twenty-five patients in the database presenting plexiform neurofibromas (N1 group) and 25 samples from the same database from patients presenting neurofibromas (N2 group) were tested. We observed positive staining for progesterone receptors in 13 of the neurofibroma samples and 19 of the plexiform neurofibroma samples. Among the neurofibroma samples, we observed one sample with positive estrogen receptor staining, but none of the plexiform neurofibroma samples showed positive staining. We suggest further studies to investigate in greater depth possible hormonal influences on the development and growth of neurofibromas and plexiform neurofibromas in NF1.

Geller, Mauro; Mezitis, Spyros G.E.; Nunes, Fabio Pereira; Ribeiro, Marcia G.; Araujo, Alexandra Prufer de Q.C.; Bronstein, Marcello D.; Siqueira-Batista, Rodrigo; Gomes, Andreia Patricia; Oliveira, Lisa; Cunha, Karin Soares Goncalves



Seismic Structural Setting of Western Farallon Basin, Southern Gulf of California, Mexico.  

NASA Astrophysics Data System (ADS)

Data from a number of high resolution 2D multichannel seismic (MCS) lines were used to investigate the structure and stratigraphy of the western Farallon basin in the southern Gulf of California. A Generator-Injector air gun provided a clean seismic source shooting each 12 s at a velocity of 6 kts. Each signal was recorded during 6- 8 s, at a sampling interval of 1 ms, by a 600 m long digital streamer with 48 channels and a spacing of 12.5 m. The MCS system was installed aboard CICESE's (Centro de Investigacion Cientifica y de Educacion Superior de Ensenada) 28 m research vessel Francisco de Ulloa. MCS data were conventionally processed, to obtain post- stack time-migrated seismic sections. The MCS seismic sections show a very detailed image of the sub-bottom structure up to 2-3 s two-way travel time (aprox. 2 km). We present detailed images of faulting based on the high resolution and quality of these data. Our results show distributed faulting with many active and inactive faults. Our study also constrains the depth to basement near the southern Baja California eastern coast. The acoustic basement appears as a continuous feature in the western part of the study area and can be correlated with some granite outcrops located in the southern Gulf of California islands. To the East, near the center of the Farallon basin, the acoustic basement changes, it is more discontinuous, and the seismic sections show a number of diffracted waves.

Pinero-Lajas, D.; Gonzalez-Fernandez, A.; Lopez-Martinez, M.; Lonsdale, P.



Eco-hydrologic role of urban parks in Queretaro City  

NASA Astrophysics Data System (ADS)

Urban parks are essential for the well-being and comfort of urban zones, vegetation plays an important role in the water balance, but these areas rarely are considered as urban infrastructure, this is why studies are necessary to assess the eco-hydrological role of urban parks and the micro climate effect of them in adjacent areas. The study is carried out during the raining seasons of 2010 and 2011 in six urban parks located in the central area of the Queretaro valley: Alameda Centro, Alamos, Alcanfores Norte, Arboledas, Cerro de las campanas and Queretaro 2000. This work aims to measure and modeling the rainfall interception process from measuring some random plots into the urban parks, also to evaluate the water balance and the runoff that is spilled to the drainage system. According to previous studies it is expected that vegetation intercepts more than 60% of total rainfall so the runoff in urban areas decrease, also to quantify the available water volume to infiltrate to aquifer recharge.

Medina Frutos, S.; Gonzalez-Sosa, E.; Mastachi-Loza, C. A.; Gutierrez-Lopez, M. A.; Ciaq



[Spinal cord compression: a multidisciplinary approach to a real neuro-oncological emergency].  


Spinal cord compression must be considered a top-priority neuro-oncological emergency. Hence, a multi-disciplinary approach and swiftness in establishing appropriate therapeutic measures are crucial to optimise the functional (and perhaps vital) prognosis of these patients. The nihilistic attitudes that have prevailed up until now in some professional sectors, possibly stemming from the perception of a poor short-term prognosis, must be completely eradicated. The overall improvement in survival rates among cancer patients in general, the availability of new neurosurgical techniques in the vast majority of our hospitals and the obvious improvements in radiotherapy equipment and techniques all this pathology to be addressed with greater chances of success. This greater likelihood of accomplishing a better outcome refers not only to the control of the development of the tumour itself, but also to pain control, maintenance of the functioning of the spinal cord and the overall survival of the patient. In this context, we consider it essential for all hospitals to have specific protocols on how to proceed in cases of acute spinal cord compression. The fact that this kind of protocol has been introduced in the Centro Medico de Asturias has prompted us to conduct a review of the current state-of-the-art in this field, with special emphasis on the evidence available for each of the modes of therapy that are discussed. PMID:23250681

Vilar-González, Santiago; Pérez-Rozos, Alberto; Torres-Campa, José M; Mateos, Valentín



Infrared Imaging Polarimetry and Photometry of S:106  

NASA Astrophysics Data System (ADS)

We present high spatial resolution IR images and imaging polarimetry observations of the bipolar nebula/outflow source Sharpless 106. Observations were made at J H, K and 3.6 ?m which characterize the morphology of the region, together with its IR photometric and polarimetric properties. We find that its morphology changes significantly over the observed wavelength range with IRS4 dominant longward of 1.25 ?m. The disc region is seen to possess highly reddened IR colours, particularly to the north of IRS 4. The H and K polarization-vector maps are centro-symmetric about IRS4 over most of the nebula, with some possible deviations in regions of the disc having the largest IR colours. The polarized-flux map shows several bright plumes extending to the east, south and west of IRS 4, while the northern bipolar lobe appears uniform in nature. We conclude that IRS4 is the only illuminating source of the region at IR wavelengths and that the disc, and possibly the circumstellar envelope around IRS4, control the appearance of the region throughout the wavelength range studied.

Aspin, C.; Rayner, J. T.; McLean, I. S.; Hayashi, S. S.



Beam Mode Expansion of Corrugated Conical Horns with Phase Correcting Lens: Application to Radioastronomy Receivers  

NASA Astrophysics Data System (ADS)

A classical radioastronomy receiver is fed with a corrugated horn and an independent lens, both placed in a cryostat to lower the noise temperature. The beam is focused and directed using a combination of elliptical and plane mirrors. This paper proposes modifying the initial feeding system by placing the lens onto the horn aperture, thereby allowing a size reduction of the horn and lens, and a simplification of their mechanical design. The profiled lens is shaped to correct the phase error on the horn aperture. A quasi-optical model of the horn-plus-lens system has been developed using a Beam Mode Expansion (BME). Results using both a hyperbolic-planar lens and a spherical-elliptical lens, as well as results obtained by using Geometrical Optics (GO) with a Kirchoff Huygens integration to get the far-field pattern, have been compared with measurements. As a direct application, a full focusing system for the new 40-m radiotelescope at the “Centro Astronómico de Yebes” is presented for the 22, 30 and 45 GHz bands. This paper has developed a QO model for a corrugated conical horn with a phase-correcting lens.

García, E.; de Haro, L.; O'Sullivan, C.; Cahill, G.; López Fernández, J. A.; Tercero, F.; Galocha, B.; Besada, J. L.



ERP Evidence for Scarce Rule Representation in Older Adults Following Short, but Not Long Preparatory Intervals  

PubMed Central

The focus of the present study was to examine the cognitive processes comprising advance preparation – rule representation, task-set updating, and task-set reconfiguration – in young (20–25?years) and older adults (61–83?years). Specifically, this study aimed at further characterizing age-related differences in advance preparation, and evaluating how additional time to prepare might reduce behavioral costs in older adults. In line with previous findings, reaction time mixing costs were slightly larger for older compared to young adults, whereas behavioral switch costs were age-invariant. Following short preparation (600?ms), smaller antero-frontal event-related potential (ERP) correlates of rule representation were associated with pronounced congruency costs in older adults. Centro-parietal ERP correlates of task-set updating and task-set reconfiguration were not delayed, but smaller in magnitude for older compared to young adults. Longer preparation (1200?ms) enabled older adults to re-activate relevant task rules, as evident in reduced congruency costs, and temporally sustained ERP correlates of task-set updating and rule representation well beyond 600?ms. Age-invariant switch costs appear related to additional, potentially compensatory frontal activity recruited by older adults to overcome difficulties in task-set reconfiguration.

Czernochowski, Daniela



Reanalysis Of The PZ Tel System: Arguments For The Reality Of PZ Tel B To Be PZ Tel b  

NASA Astrophysics Data System (ADS)

I will present some new analysis of the PZ Tel system, which has recently been shown to host a young companion with a mass of around 30 Jupiter-masses, along with a debris disk of around 0.3 Lunar-masses. We have reanalyzed the iron abundance of the host star using our new spectral synthesis method, and contrary to previous results, we find the star to be super metal-rich, with a metallicity ([Fe/H]) of 0.2 dex. We also find the age of the system from chromospheric activities and pre-main sequence evolutionary models to be around 25Myrs. I will show some comparisons between the companion's bulk properties, such as broadband colours, and some of the latest evolutionary models as a function of metallicity. Finally, I will use these results to show how the companion to PZ Tel could be the first directly imaged extreme-Jovian extrasolar planet and not a low-mass brown dwarf. I acknowledge funding by Fondecyt through grant 3110004 and partial support from Centro de Astrofisica FONDAP 15010003, the GEMINI-CONICYT FUND and from the Comite Mixto ESO-GOBIERNO DE CHILE.

Jenkins, James



Beneficial lactobacilli: effects on the vaginal tract in a murine experimental model.  


Vaginal probiotics containing lactic acid bacteria with activity towards pathogenic microorganisms that cause urogenital tract infections have been proposed as a valid strategy for their prophylaxis and therapy. A murine experimental model was set up to evaluate the colonization capability of beneficial human lactobacilli and their effects on the mouse vaginal mucosa and innate immune cells. Five Lactobacillus strains were intravaginally inoculated into previously estrogenized BALB/c mice. The significance of the effects observed in the vaginal tract was determined by analysis of variance using the general linear model. The numbers of viable vaginal lactobacilli were significantly higher at proestrous-estrous than those at the metaestrous-diestrous phase and decreased markedly on the days after inoculation. Lactobacilli inoculation did not cause cytological or histological modifications of the murine vaginal tract. Moreover, the intravaginal administration of Lactobacillus salivarius CRL (Centro de Referencia para Lactobacilos culture collection) 1328 and Lactobacillus gasseri CRL 1263 did not affect the amounts of granulocytes and macrophages present in vaginal washings. In conclusion, the results demonstrate that vaginal lactobacilli did not produce adverse effects on the murine vaginal tract. Therefore, they could be proposed as safe probiotic candidates to promote a balanced microbiota in the urogenital tract. PMID:22638932

De Gregorio, Priscilla Romina; Juárez Tomás, María Silvina; Santos, Viviana; Nader-Macías, María Elena Fatima



Estudio multiespectral del remanente de supernova W 28  

NASA Astrophysics Data System (ADS)

Se presentan observaciones en continuo de radio con muy alta resolución angular y sensibilidad del remanente de supernova (RSN) W28. Las observaciones fueron realizadas con el interferómetro Very Large Array (Estados Unidos), en las configuraciones C y D, en 1415 y 324 MHz. Por la gran extensión de este remanente (diámetro ~ 1o), las observaciones en 1415 MHz se realizaron en modo mosaico, combinando 48 apuntamientos diferentes en una única imagen. En ambas frecuencias los datos se procesaron con el agregado de observaciones de menor resolución angular, a fin de recuperar información en todas las frecuencias espaciales y obtener estimaciones precisas de densidad de flujo. Las imágenes resultantes muestran por primera vez la presencia de extensiones con forma de arco, cuya naturaleza se investiga. Las observaciones en radio se comparan con una imagen óptica de W28, y con la emisión en rayos X, observada con el satélite ROSAT. Este remanente muestra una clara morfología híbrida, tipo cáscara en frecuencias de radio y de centro lleno en las bandas óptica y de rayos X blandos.

Dubner, G.; Velázquez, P.; Castelletti, G.


Las Migraciones en el Proceso de Integracion de las Americas: Seminario Internacional (Migration in the Integration Process in the Americas: International Seminar). Conference report.  


This conference report of the Centro de Estudios Migratorios Latinoamericanos and the Center for Migration Studies pertains to meetings held in August 1992. Summary information on migration movements in Latin America is presented by region and subject. The topic of integration in the Americas was presented by Mr. Lelio Marmora. Other topics and presenters include the new Colombian Migration Policy (Mr. Carlos Adolfo Arenas), the integration policies in Central America (Mr. Pilar Norza of Costa Rica, Raimundo Alvarado of El Salvador, and Luis Armando Gusman of Nicaragua), the Andean Pact agreements (representatives of each country), US immigration policy (Charles B. Keely), the Mexican integration with Latin America and immigration to the US (Jorge Bustamante), migration to Bolivia and Argentina and Chile, and transnationalism in the Caribbean (Professor Andre Corten). Migration policy needs to be tailored specifically to the situation in Latin America, and greater attention needs to be devoted to labor migrants' rights and working conditions. There are still fundamental differences among countries in policies regarding the free circulation of persons across borders. There is a division among those who support migration and those who are realists. National sovereignty issues are solvable because of a common national past and a relatively homogenous population. Another opinion is that Latin America is more diverse than commonly recognized. Capital is protected more in international agreements than is migrant labor. Regional integration for the US does mean immigration from Mexico. The US sees Mexican migration as a policy problem, and Mexico sees migration as a labor opportunity. PMID:12346329

Berglund, S



The Internal tide at San Esteban sill in the Gulf of California  

NASA Astrophysics Data System (ADS)

Results are discussed from a short survey in the Gulf of California to evaluate the parameters of internal tidal waves generated at San Esteban sill and to test new technology and equipment designed to make these measurements. Aboard the BIP XII oceanographic research vessel of the Centro de Investigaciones Biológicas del Noroeste de Guaymas, Sonora, different measurements of internal waves were performed using: a) a tow-yo CTD SBE-19plus; 2) two temperature and pressure sensors arrays and an ADCP, towed one behind the other with a new towing design; and c) an array of 14 HOBO thermographs, distributed at different depths. Data show that the semidiurnal barotropic tide at San Esteban sill causes a hydraulic jump and a non linear internal tide (with a steep leading slope). This wave propagates to the North, during ebb, and to the South, during flow of the barotropic wave. The internal tide in the Gulf of California generates significant variations of temperature and salinity as deep as 150 m depth. At the leading edge of this wave a group of 8-10 solitons is regularly found, with maximum amplitudes above 50 m, weave length of 1250 to 1500 m, and phase velocities from 1.2 to 1.4 m/s. These short non-linear wave groups capture and disperse the energy of the internal “mother wave”, generating turbulence, vertical and horizontal mixing, and diffusion and dispersion of nutrients and plankton.

Filonov, A.



[Identification and genetic variability of annatto genotypes (Bixa orellana L.) by means of hydrosoluble proteins and isoenzymes].  


In order to identify and to determine the genetic variability of 36 annatto genotypes (Bixa orellana L.) collected in five Venezuelan regions (Oriente, Centro, Llanos, Andes and Amazonas) and in Brazil, hydrosoluble protein patterns as well as specific isozyme patterns (alpha-esterase, beta-esterase and peroxidase) were studied using extracts of germinated annatto seeds with radicles of 10 to 15 mm long. Each electrophoretic system allowed genotype discrimination by means of unique banding patterns: both the hydrosoluble protein and the electrophoretic system of beta-esterase with nine banding patterns each; whilst alpha-esterase and peroxidase discriminated eight and three genotypes, respectively. On the other hand, a combination of all the systems permitted a greater discrimination since 34 out of 36 genotypes could be distinguished. Eight mayor groups were formed that showed high levels of genetic diversity (40 to 60%) with no association between geographic and genetic distances, probably because of human influence in the aleatory distribution of this crop. Results obtained indicated that using electrophoretic banding patterns, a classification system could be established for identification and genetic variability purposes in this species. PMID:11510424

Medina, A M; Michelangeli, C; Ramis, C; Díaz, A



Unidirectional molecular stacking of tribenzotriquinacenes in the solid state: a combined X-ray and theoretical study.  


A combined X-ray diffraction and theoretical study of the solid-state molecular and crystal structures of tribenzotriquinacene (TBTQ, 2) and its centro-methyl derivative (3) is presented. The molecular structure of the parent hydrocarbon displays C3v symmetry and the three indane wings adopt mutually orthogonal orientations, similar to the case in its previously reported methyl derivative (3). Also similarly to the latter structure, the bowl-shaped molecules of compound 2 form infinite molecular stacks with perfectly axial, face-to-back (convex-concave) packing and with parallel and unidirectional orientation of the stacks. The experimentally determined intra-stack molecular distance is 4.75?Å for compound 2 and 5.95?Å for compound 3. Whereas the molecules of compound 2 show a slight alternating rotation (±6°) about the common axis of each stack, those of compound 3 show perfect translational symmetry within the stacks. We used dispersion-corrected density functional theory to compute the crystal structures of tribenzotriquinacenes 2 and 3. The London dispersion correction was crucial for obtaining an accurate description of the crystallization of both analyzed systems and the calculated results agreed excellently with the experimental measurements. We also obtained reasonable sublimation energies for both compounds. In addition, the geometries and dimerization energies of oligomeric stacks of compound 2 were computed and showed smooth convergence to the properties of the infinite polymeric stack. PMID:23766137

Brandenburg, Jan Gerit; Grimme, Stefan; Jones, Peter G; Markopoulos, Georgios; Hopf, Henning; Cyranski, Micha? K; Kuck, Dietmar



Third order nonlinear studies and other characterization of 4-nitrophenol (4-NP) single crystals  

NASA Astrophysics Data System (ADS)

The 4-nitro phenol is an organic NLO material. The commercially available 4-nitrophenol was recrystallized in acetone two times to purify the materials. The single crystal of pure 4-nitro phenol (4-NP) compound was grown by slow evaporation and slow cooling techniques using acetone as a solvent. The grown crystals were subjected to various characterization studies. The powder XRD spectrum of 4-NP shows the good crystalline nature of the grown crystal. The lattice parameter values of the grown 4-NP crystals were calculated from single crystal XRD data as a=6.09Å, b=8.79 Å, c=11.61 Å, ?=?=90°, ?=103.15. 4-NP crystallizes in monoclinic crystal system with the space group of P21/c. The crystals obtained by slow evaporation technique were subjected to FTIR spectrum. The resultant FTIR spectrum confirms the various functional groups present in 4-NP. The Vis-IR spectrum of 4-NP shows the cut off wave length of 403nm. The differential thermal analysis of 4-NP shows that the melting point of the compound is 115°C. As it crystallizes in centro symmetric space group, it is suitable for third harmonic generation. The nonlinear absorption coefficient (?) and non linear refractive index (n2) were calculated as ?=5.03859×10-6 cm/W and n2=1.45967×10-11cm2/W respectively by using Z-scan technique.

Gandhimathi, R.; Dhanasekaran, R.



Modeling and simulation of an amplified structural damping system in a seismically-excited truss tower  

NASA Astrophysics Data System (ADS)

In the present work, numerical simulations are carried out to investigate a passive amplified structural damping system, the scissor-jack damper, for controlling vibrations in a seismically-excited truss tower. To reduce computational effort, a bi-model method is employed to represent the 3D truss tower as a dynamically equivalent 2D lumped-mass model. For the scissor-jack damper, a new formulation for the amplification factor equation of the device is presented, and then validated using CAD. The new formulation accounts for the large deformations experienced by the device as a result of the large displacements present in the flexible tower during seismic loading. In order to capture the interaction between the structure and control device, the displacement-dependent amplification factors of the scissor-jack devices, and velocity-dependent forces of the dampers, are calculated at each time step. The resulting amplified damper force is then applied back to the structure to determine its response at the next time step. The response of the tower with scissor-jack damper systems is simulated for the El Centro and Northridge earthquakes, and time-histories of the displacement and absolute acceleration at each level of the tower are obtained. These results indicate that the system is effective in reducing overall response of the tower without exceeding practical limits on the stroke capacity of the scissor-jack dampers.

Walsh, Kenneth K.; Cronin, Kyle J.; Rambo-Roddenberry, Michelle D.; Grupenhof, Kyle



Thermal Analysis of the ILC Superconductin Quadrupole  

SciTech Connect

Critical to a particle accelerator's functioning, superconducting magnets serve to focus and aim the particle beam. The Stanford Linear Accelerator Center (SLAC) has received a prototype superconducting quadrupole designed and built by the Centro de Investigaciones Energ{acute e}ticas, Medioambientales y Tecnol{acute o}gicas (CIEMAT) to be evaluated for the International Linear Collider (ILC) project. To ensure proper functioning of the magnet, the device must be maintained at cryogenic temperatures by use of a cooling system containing liquid nitrogen and liquid helium. The cool down period of a low temperature cryostat is critical to the success of an experiment, especially a prototype setup such as this one. The magnet and the dewar each contain unique heat leaks and material properties. These differences can lead to tremendous thermal stresses. The system was analyzed mathematically, leading to ideal liquid helium and liquid nitrogen flow rates during the magnet's cool-down to 4.2 K, along with a reasonable estimate of how long this cool-down will take. With a flow rate of ten gaseous liters of liquid nitrogen per minute, the nitrogen shield will take approximately five hours to cool down to 77 K. With a gaseous helium flow rate of sixty liters per minute, the magnet will take at least nineteen hours to cool down to a temperature of 4.2 K.

Ross, Ian; /Rose-Hulman Inst., Terre Haute /SLAC



The precipitation products generation chain for the EUMETSAT Hydrological Satellite Application Facility at C.N.M.C.A.  

NASA Astrophysics Data System (ADS)

The EUMETSAT Satellite Application Facility in support to Hydrology (H-SAF) focuses on development of new geophysical products on precipitation, soil moisture and snow parameters and the utilisation of these parameters in hydrological models, NWP models and water management. The development phase of the H-SAF started in September 2005 under the leadership of Italian Meteorological Service. The "Centro Nazionale di Meteorologia e Climatologia Aeronautica (C.N.M.C.A.)", the Italian National Weather Centre, that physically hosts the generation chain of precipitation products, carried on activities to reach the final target: development of algorithms, validation of results, implementation of operative procedure to supply the service and to monitor the service performances. The paper shows the architectural status of the H-SAF precipitation group and stress the component of operations. It is shown the full correspondence with the EUMETSAT approved H-SAF documents, in particular the Algorithm Theoretical Design Document (ATDD), where products characteristics are referenced. Are also reported the first results, produced during the first H-SAF Workshop, held in Rome in October 2007, of validation activities performed on version 1 products, and last results of products distribution to beta-users in preparation of distributing version 2.

Biron, Daniele; Melfi, Davide; Zauli, Francesco



Conflict adaptation and cognitive control adjustments following traumatic brain injury.  


Survivors of severe traumatic brain injury (TBI) often demonstrate impairments in the cognitive control functions of detecting response conflict and signaling for recruitment of cognitive resources to appropriately adjust performance. These cognitive control functions can be measured using conflict adaptation effects, wherein manifestations of conflict detection and processing are reduced following high- relative to low-conflict trials. Event-related potentials (ERPs) were collected while 18 survivors of severe traumatic brain injury (TBI) and 21 demographically matched control participants performed a modified Stroop task. The incongruent-minus-congruent trial Stroop effect for trials preceded by incongruent (high conflict) and congruent (low conflict) trials were compared for behavioral (response time [RT] and error rate) and ERP reflections of cognitive control. Behavioral data showed a reduction in the Stroop effect for both control and TBI participant RTs when preceded by incongruent trials. The magnitude of these effects did not differentiate control and TBI participants. ERP data revealed a centro-parietal conflict slow potential (conflict SP) that differentiated incongruent from congruent trials. Planned comparisons showed a decreased amplitude conflict SP when ERPs were preceded by incongruent trials in control, but not TBI participants. Results indicate subtle TBI-related impairments in conflict resolution mechanisms in the context of intact RT-related conflict adaptation. PMID:19765356

Larson, Michael J; Kaufman, David A S; Perlstein, William M



Characterisation of the plutonium isotopic composition of a sediment core from Palomares, Spain, by low-energy AMS and alpha-spectrometry  

NASA Astrophysics Data System (ADS)

The measurement of plutonium isotopes, 239Pu and 240Pu, at 670 kV on the compact accelerator mass spectrometry (AMS) system at the Centro Nacional de Aceleradores (CNA) in Seville, Spain, is now a reality. In this work, we present first Pu AMS results for environmental samples: a sediment core collected in a submarine canyon in the Mediterranean coast of the Spanish region of Palomares, affected by a nuclear accident in 1966. From the study of the 240Pu/239Pu atomic ratio profile, showing on average levels lower than 11%, we confirm that the weapon-grade plutonium released on land during the accident, with a characteristic 240Pu/239Pu atomic ratio of 5.8%, has found its way into the marine environment. A two-plutonium sources mixture model (Palomares and fallout) is used to elucidate the percentage of the plutonium coming from the accident. As a validation exercise of the Pu AMS measuring technique and in order to obtain the 238Pu/(239+240)Pu activity ratios, samples were also studied by alpha-spectrometry (AS). The obtained AS 239+240Pu activity concentration results fit in with the AMS ones in a wide dynamic range, thus validating the AMS technique.

Chamizo, E.; Jiménez-Ramos, M. C.; Enamorado, S. M.; García-León, M.; García-Tenorio, R.; Mas, J. L.; Masqué, P.; Merino, J.; Sanchez-Cabeza, J. A.



Temporal trends of Cd, Cu, Hg, Pb and Zn in mussel (Mytilus galloprovincialis) from the Spanish North-Atlantic coast 1991-1999.  


Temporal trends for heavy metals (Cd, Cu, Hg, Pb and Zn) in mussel (Mytilus galloprovincialis) from the Galician and Cantabrian areas in Spain, where samples were yearly collected from 1991 to 1999, are presented. This study was carried out by the Centro Oceanográfico de Vigo of the Instituto Español de Oceanografia (I.E.O.) as part of the Spanish contribution to the Joint Assessment and Monitoring Programme (JAMP) of the OSPAR Convention. The experimental work and subsequent statistical treatment, following OSPAR procedures and guidelines, are described. In order to carry out the statistical treatment of the data, median values of the different shell length classes were used for each contaminant, year and area. The Kendall T-b correlation coefficient was used with the purpose of demonstrating the existence of a downward significant temporal trend in the pollution levels, according to the advice of ICES Working Group on Statistical Aspects of Environmental Monitoring. A decrease of copper levels was detected in Vigo, Pontevedra and Arosa, of mercury in Pontevedra and A Coruña, of lead in Vigo, Pontevedra, A Coruña and Bilbao and of zinc in Pontevedra and A Coruña. However, a cadmium positive trend was registered at Ria de Vigo. No significant trends were detected in the other cases. PMID:11991527

Besada, V; Fumega, J; Vaamonde, A



Results from the Prototype GLOBE at Night Worldwide Light Pollution Observation Program  

NASA Astrophysics Data System (ADS)

Students, families, and educators worldwide participated in GLOBE at Night - an international event designed to observe and record the visible stars as a means of measuring light pollution in a given location. Participation was open to anyone - anywhere in the world - who could get outside and look skyward during the week of March 22-29, 2006. Our goal was 5000 observations from around the world in this prototype program.The hands-on learning activities associated with the program were designed to extend the traditional classroom and school day with a week of nighttime observations involving teachers, students and their families. By locating specific constellations in the sky, students from around the world learned how the lights in their community contribute to light pollution. Students explored the different light sources in their community learning the relationship between science, technology and society, and they reported their observations online through a central database allowing for authentic worldwide research and analysis. The observations made during GLOBE at Night helped students and scientists together assess how the quality of the night sky varies around the world as well as the level of energy wastage associated with poorly-shielded lights.For more information, visit at Night is a collaboration between The GLOBE Program, the National Optical Astronomy Observatory (NOAO), Centro de Apoyo a la Didactica de la Astronomia (CADIAS) in Chile , Windows to the Universe, and Environmental Systems Research Institute, Inc. (ESRI).

Walker, Constance E.; Pompea, S. M.; Isbell, D.; Orellana, D.; Blurton, C.; Henderson, S.



Statistical analysis of sleep spindle occurrences.  


Spindles - a hallmark of stage II sleep - are a transient oscillatory phenomenon in the EEG believed to reflect thalamocortical activity contributing to unresponsiveness during sleep. Currently spindles are often classified into two classes: fast spindles, with a frequency of around 14 Hz, occurring in the centro-parietal region; and slow spindles, with a frequency of around 12 Hz, prevalent in the frontal region. Here we aim to establish whether the spindle generation process also exhibits spatial heterogeneity. Electroencephalographic recordings from 20 subjects were automatically scanned to detect spindles and the time occurrences of spindles were used for statistical analysis. Gamma distribution parameters were fit to each inter-spindle interval distribution, and a modified Wald-Wolfowitz lag-1 correlation test was applied. Results indicate that not all spindles are generated by the same statistical process, but this dissociation is not spindle-type specific. Although this dissociation is not topographically specific, a single generator for all spindle types appears unlikely. PMID:23560045

Panas, Dagmara; Malinowska, Urszula; Piotrowski, Tadeusz; ?ygierewicz, Jaros?aw; Suffczy?ski, Piotr



Disturbed resting state EEG synchronization in bipolar disorder: A graph-theoretic analysis?  

PubMed Central

Disruption of functional connectivity may be a key feature of bipolar disorder (BD) which reflects disturbances of synchronization and oscillations within brain networks. We investigated whether the resting electroencephalogram (EEG) in patients with BD showed altered synchronization or network properties. Resting-state EEG was recorded in 57 BD type-I patients and 87 healthy control subjects. Functional connectivity between pairs of EEG channels was measured using synchronization likelihood (SL) for 5 frequency bands (?, ?, ?, ?, and ?). Graph-theoretic analysis was applied to SL over the electrode array to assess network properties. BD patients showed a decrease of mean synchronization in the alpha band, and the decreases were greatest in fronto-central and centro-parietal connections. In addition, the clustering coefficient and global efficiency were decreased in BD patients, whereas the characteristic path length increased. We also found that the normalized characteristic path length and small-worldness were significantly correlated with depression scores in BD patients. These results suggest that BD patients show impaired neural synchronization at rest and a disruption of resting-state functional connectivity.

Kim, Dae-Jin; Bolbecker, Amanda R.; Howell, Josselyn; Rass, Olga; Sporns, Olaf; Hetrick, William P.; Breier, Alan; O'Donnell, Brian F.



Habit modification of bis-thiourea zinc chloride (ZTC) semi organic crystals by impurities.  


Single crystals of bis-thiourea zinc chloride (ZTC) doped with metal ion (Li(+)) possess excellent nonlinear optical properties. These crystals were grown by slow evaporation solution growth technique. The effect of Li(+) dopant on the growth and properties of ZTC single crystal were investigated and reported. The grown crystals were crystallized in orthorhombic structure with non-centro symmetric space group Pn21a through the parent compound. The amount of dopant incorporated in the parent crystal was revealed by the inductively coupled plasma (ICP-OES) studies. The FT-IR spectroscopy study was done for finding and confirming the functional groups present in the compound. The UV-Visible spectral study was carried out to find the optical behavior and transparency nature of the grown crystal. TG/DTA measurements and Vickers microhardness measurements were traced to find out the thermal and mechanical stability of the grown crystals respectively. Using Nd:YAG laser, the Second harmonic generation (SHG) for the grown crystals were confirmed. PMID:23571088

Ruby Nirmala, L; Thomas Joseph Prakash, J



COROT and OMC archives  

NASA Astrophysics Data System (ADS)

COROT (COnvection, ROtation and Transits) is a satellite launched in December 2006 with two principal objectives: the study of stellar interiors using asteroseismology techniques, and the discovery of extrasolar planets using the transit method. The Data Archive Unit of the Centro de Astrobiología (CAB) is one of the data centers from where it is possible to access COROT public data ( In this paper the main functions of the COROT public archive at CAB are described.The archive has been developed in the framework of the Spanish Virtual Observatory following the standards defined by the International Virtual Observatories Alliance (IVOA, At present it contains over ninety thousand light curves with an unprecedented photometric accuracy and time resolution. Also, the OMC (Optical Monitoring Camera, an instrument onboard the INTEGRAL satellite) archive ( is in operation since 2003 and contains more than sixty thousand light curves of high photometric quality.We describe here the main functionalities of both systems.

Velasco Trasmonte, A.; Gutiérrez Sánchez, R.; Solano Márquez, E.



45th annual meeting of the Italian Cancer Society. Bergamo, 9-12 November 2003.  


The 45th Annual Meeting of the Italian Cancer Society (SIC), held at the Centro Congressi Giovanni XXIII in Bergamo, Italy on 9-12 November, 2003, attracted almost 400 participants. The Scientific Committee chaired by R Giavazzi (Mario Negri Institute, Bergamo) and the board of the Italian Cancer Society produced a packed and varied program. Plenary sessions with keynote speakers (24 lectures) were combined with oral proffered papers (20 selected presentations), providing a platform from laboratory science to clinical interventions. Two hundred and sixty-one abstracts were submitted to the conference and presented in poster and poster discussion sessions, providing a stimulating ground for discussion and a network of interactive collaboration among young investigators. The venue of Bergamo offered exceptional hospitality with social events in the beautiful old town and at the Modern Art Museum. We hope that the following report gives an idea of the event and will encourage the reader to attend the 46th meeting of the SIC, 24-26 October, 2004 in Pisa. PMID:15315322

Giavazzi, Raffaella; Aglietta, Massimo; Astolfi, Annalisa; Falanga, Anna; Fusco, Alfredo; Labianca, Roberto; Lollini, Pier Luigi; Lombardo, Claudio; Natali, Pier Giorgio; Pierotti, Marco A; Presta, Marco; Santoro, Massimo; Taraboletti, Giulia; Zupi, Gabriella; Vecchio, Giancarlo


Mapping the spatial distribution of global anthropogenic mercury atmospheric emission inventories  

NASA Astrophysics Data System (ADS)

This paper describes the procedures employed to spatially distribute global inventories of anthropogenic emissions of mercury to the atmosphere, prepared by Pacyna, E.G., Pacyna, J.M., Steenhuisen, F., Wilson, S. [2006. Global anthropogenic mercury emission inventory for 2000. Atmospheric Environment, this issue, doi:10.1016/j.atmosenv.2006.03.041], and briefly discusses the results of this work. A new spatially distributed global emission inventory for the (nominal) year 2000, and a revised version of the 1995 inventory are presented. Emissions estimates for total mercury and major species groups are distributed within latitude/longitude-based grids with a resolution of 1×1 and 0.5×0.5°. A key component in the spatial distribution procedure is the use of population distribution as a surrogate parameter to distribute emissions from sources that cannot be accurately geographically located. In this connection, new gridded population datasets were prepared, based on the CEISIN GPW3 datasets (CIESIN, 2004. Gridded Population of the World (GPW), Version 3. Center for International Earth Science Information Network (CIESIN), Columbia University and Centro Internacional de Agricultura Tropical (CIAT). GPW3 data are available at The spatially distributed emissions inventories and population datasets prepared in the course of this work are available on the Internet at

Wilson, Simon J.; Steenhuisen, Frits; Pacyna, Jozef M.; Pacyna, Elisabeth G.


Habit modification of bis-thiourea zinc chloride (ZTC) semi organic crystals by impurities  

NASA Astrophysics Data System (ADS)

Single crystals of bis-thiourea zinc chloride (ZTC) doped with metal ion (Li+) possess excellent nonlinear optical properties. These crystals were grown by slow evaporation solution growth technique. The effect of Li+ dopant on the growth and properties of ZTC single crystal were investigated and reported. The grown crystals were crystallized in orthorhombic structure with non-centro symmetric space group Pn21a through the parent compound. The amount of dopant incorporated in the parent crystal was revealed by the inductively coupled plasma (ICP-OES) studies. The FT-IR spectroscopy study was done for finding and confirming the functional groups present in the compound. The UV-Visible spectral study was carried out to find the optical behavior and transparency nature of the grown crystal. TG/DTA measurements and Vickers microhardness measurements were traced to find out the thermal and mechanical stability of the grown crystals respectively. Using Nd:YAG laser, the Second harmonic generation (SHG) for the grown crystals were confirmed.

Ruby Nirmala, L.; Thomas Joseph Prakash, J.



Near-IR photometry of five Galactic Globular Clusters  

NASA Astrophysics Data System (ADS)

We present near-infrared J and K observations of giant stars in five metal-poor Galactic Globular Clusters (namely M 3, M 5, M 10, M 13 and M 92) obtained at the Telescopio Nazionale Galileo (TNG). This database has been used to determine the main photometric properties of the red giant branch (RGB) from the (K, J-K) and, once combined with the optical data, in the (K, V-K) Color Magnitude Diagrams. A set of photometric indices (the RGB colors at fixed magnitudes) and the major RGB evolutionary features (slope, bump, tip) have been measured. The results have been compared with the relations obtained by \\citet{F00} and with the theoretical expectations, showing a very good agreement. Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Centro Galileo Galilei of the Consorzio Nazionale per l'Astronomia e l'Astrofisica (CNAA) at the Spanish Observatory del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Catalogs are only available in electronic form at the CDS via anonymous ftp to ( or via

Valenti, E.; Ferraro, F. R.; Perina, S.; Origlia, L.



The late positive potential, emotion and apathy in Parkinson's disease  

PubMed Central

Parkinson’s disease is associated with emotional changes including depression, apathy, and anxiety. The current study investigated emotional processing in non-demented individuals with Parkinson disease (PD) using an electrophysiological measure, the centro-parietal late positive potential (LPP). Non-demented patients with Parkinson’s disease (n=17) and healthy control participants (n=16) viewed pleasant, neutral, and unpleasant pictures while EEG was recorded from a 64-channel geodesic net. The Parkinson patients did not differ from controls in terms of early electrophysiological components that index perceptual processing (occipital P100, N150, P250). Parkinson patients, however, showed reduced LPP amplitude specifically when viewing unpleasant, compared to pleasant, pictures as well as when compared to controls, consistent with previous studies suggesting a specific difference in aversive processing between PD patients and healthy controls. Importantly, LPP amplitude during unpleasant picture viewing was most attenuated for patients reporting high apathy. The data suggest that apathy in PD may be related to a deficit in defensive activation, and may be indexed cortically using event-related potentials.

Dietz, J.; Bradley, M. M.; Jones, J.; Okun, M. S.; Perlstein, W. M.; Bowers, D.



Paroxysmal discharges on EEG in young autistic patients are frequent in frontal regions.  


EEGs were recorded in 86 autistic patients during sleep. Epileptic discharges were observed in 37 cases (43%). Twenty-seven (73%) of these 37 cases had localized spikes, 8 had multiple spike foci, one had generalized spikes, and one had both multiple spike foci and generalized spikes. Forty-seven epileptic discharge foci were registered in 36 cases, the exception being one with generalized spikes. Thirty-six (76.6%) of the registered 47 epileptic discharge foci were in the frontal region, one (2.1%) in the temporal region, 7 (14.1%) in the centro-parietal region, and 3 (6.4%) in the occipital region. Twenty (55.6%) of the 36 frontal spikes were at midline (11 at Fz and 9 at Cz), 8 on the left side, and 8 on the right side. The dipole of midline spikes was in the deep midline frontal region. These results suggest that frontal dysfunctions are important in the mechanism of symptoms in autism. PMID:11694957

Hashimoto, T; Sasaki, M; Sugai, K; Hanaoka, S; Fukumizu, M; Kato, T



Rocket-borne Langmuir Probe response to an applied periodic potential  

NASA Astrophysics Data System (ADS)

A Langmuir Probe (LP), payload designed and developed at Instituto de Pesuisas Espaciais (INPE/MCT) was flown on board a SONDA III rocket at 2259 hrs. (LST) on October 31, 1986 from the Centro de Lancamento da Barreira do Inferno in Natal, RN, Brazil, under a collaborative program between INPE and Instituto de Atividades Espaciais (IAE/CTA). The rocket reached an apogee of about 444 km and the LP payload functioned satisfactorily during the ascent as well as descent of the rocket. A sweep voltage varying between -1V and +4V in a period of about 2.6 seconds was applied to the LP sensor. As the applied voltage increased from -1V to +4V, the LP sensor current first showed an increase, reached a saturation level, and then, though the sensor potential increased towards a steady value, the current showed a systematic decrease. This sensor current characteristic also showed a clear dependence on altitude and hence on the ambient plasma parameters. Possible physical mechanisms responsible for these LP response characteristics are analyzed and discussed here.

Muralikrishna, P.; Abdu, M. A.; Kantor, I. J.



First-order ion-optics calculations for an Accelerator Mass Spectrometry system using SRIM and S3M  

NASA Astrophysics Data System (ADS)

In this paper, we describe the transport of a simulated beam, created with the S3M beam generation module, along the real beam line of the Accelerator Mass Spectrometry (AMS) facility located at Centro Nacional de Aceleradores (CNA, Seville, Spain). The beam transport through the optical system was determined using the transfer-matrix method, which can easily calculate the beam envelopes without having to track all individual particles, evaluating the ability of such systems and saving computation time.The beam size results given by S3M were compared to the real beam size in three of the four image points that the system has (P1, P2 and P3), corresponding with the position of Faradays Cups where the 127I current was measured, obtaining a good agreement between them. This suggests that the first order approximation model is enough to simulate the optical behavior of the system. It is shown that the beam line has a focusing behavior, minimizing the beam size from ±3 mm at the exit of the ion source to ±1.09 mm at the detector's entrance window. Using the beam emittance diagram simulations, it is shown that when ions pass through the stripper, the angles of their trajectories are altered by scattering with the gas molecules and the geometrical emittance enlarges, according to Liouville's Theorem.The study presented in this work gives confidence and open new perspectives in simulations with S3M in AMS facilities contributing to the understanding of their optical behavior.

Gómez-Guzmán, J. M.; Gómez-Morilla, I.; Enamorado-Báez, S. M.; Moreno Suárez, A. I.; Pinto-Gómez, A. R.



Measurement of neutron spectra generated by a 62 AMeV carbon-ion beam on a PMMA phantom using extended range Bonner sphere spectrometers  

NASA Astrophysics Data System (ADS)

Neutrons constitute an important component of the radiation environment in hadron therapy accelerators. Their energy distribution may span from thermal up to hundred of MeV. The characterization of these fields in terms of dosimetric or spectrometric quantities is crucial for either the patient protection or the facility design aspects. To date, the Extended Range Bonner Sphere Spectrometer (ERBSS) is the only instrument able to simultaneously determine all spectral components in such workplaces. With the aim of providing useful data to the scientific community involved in neutron measurements at hadron therapy facilities, a measurement campaign was carried out at the Centro di AdroTerapia e Applicazioni Nucleari Avanzate (CATANA) of INFN-LNS (Laboratori Nazionali del Sud), where a 62 AMeV carbon ion is available. The beam was directed towards a PMMA phantom, simulating the patient, and two neutron measurement points were established at 0° and 90° with respect to the beam-line. The ERBSSs of UAB (Universidad Autónoma de Barcelona-Grup de Física de les Radiacions) and INFN (Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali di Frascati) were used to measure the resulting neutron fields. The two ERBSSs use different detectors and sphere diameters, and have been independently calibrated. The FRUIT code was used to unfold the results.

Bedogni, R.; Amgarou, K.; Domingo, C.; Russo, S.; Cirrone, G. A. P.; Pelliccioni, M.; Esposito, A.; Pola, A.; Introini, M. V.; Gentile, A.



High temporal resolution dynamic mapping of instantaneous EEG amplitude modulation after tone-burst auditory stimulation.  


A new method of instantaneous EEG analysis based on amplitude modulation (AM-EEG) was applied to analyze the AM-EEG changes in the alpha frequency band (8.20-12.89 Hz) for successive 5 ms epochs. Repeated auditory tone-burst stimuli (of 220 ms duration) were presented at fixed 2.56 second intervals to 12 attending right-handed young female volunteers, who were EEG-recorded over 19 EEG channels at 200 Hz sampling frequency. The time-course of functional activation was characterized in terms of percent decrease in instantaneous amplitude modulation, as compared to baseline, in analogy with the classical event-related desynchronization paradigm. A dynamic sequence of the successive 122 AM-EEG maps obtained for the 610 ms from beginning of tone-burst was stored and later animated on PC microcomputer. Topological changes among successive maps were extracted into 40 specific AM-EEG maps. Early left temporal and centro-temporal activation was observed, followed first by strong bilateral frontal, and then by left temporal activation. These changes induced by a warning tone-burst are discussed in terms of functional neurophysiology. The present method therefore allows an improved time-resolution for functional brain activation paradigms. PMID:10642012

Etévenon, P; Lebrun, N; Clochon, P; Perchey, G; Eustache, F; Baron, J C



[Clinical practice guideline. Traumatic urethral stenosis in males].  


The incidence of urethral stenosis in Mexico had not been documented. At the Centro Médico Nacional La Raza, during the year 2010, 629 patients with urethral stenosis were attended as outpatient consultation: 85 % with previous urethral stenosis and 15 % with urethral treatment complication. Urethral stenosis is a chronic illness, with multiple etiological origins and the handling is controversial. It has a great negative impact for the patients and the recurrence reaches 85 %. The treatment consisted of an invasive approach (urethral dilations, endoscopy procedure) and open surgery (urethroplasty). The World Health Organization and World Alliance take the world challenge about the urinary tract infections associated with the attention of patients, focused on urethral stenosis. The objective of the following clinical guide is to offer to the health professional a clinical tool for making decisions in the handling of the hardship or masculine urethral stenosis, based on the best available evidence, carrying out in systematized form with bibliographical research using validated terms of the MeSH: urethral structures, in the databases Trip database, PubMed, Guideline Clearinghouse, Cochrane Library and Ovid. PMID:24021082

Serrano-Brambila, Eduardo Alonso; Moreno-Alcázar, Othón Martino; Neri-Páez, Edgar; Sánchez-Martínez, Luis Carlos; Hernández-Ordóñez, Octavio Francisco; Morales-Morales, Arturo; Basavilvazo-Rodríguez, M Antonia; Torres-Arreola, Laura del Pilar; Valenzuela-Flores, Adriana Abigail; Hernández-Valencia, Marcelino


[The use of chest X-rays for surveillance of bacterial pneumonias in children in Latin America].  


The Division of Vaccines and Immunization of the Pan American Health Organization (PAHO) is promoting epidemiological surveillance of bacterial pneumonias in children in Latin America in order to generate scientific evidence to support future decisions concerning using vaccines to control such pneumonias in the countries of the Region of the Americas. The diagnosis of these diseases rarely includes bacteriological documentation of the causative agent. Therefore, studies of this type that are carried out around the world accept radiological images of alveolar consolidation as a confirmatory criterion for a presumptively bacterial pneumonia. This piece examines the theoretical rationale and requirements for using thorax radiology as an instrument for epidemiological surveillance of bacterial pneumonias. The piece also summarizes the activities carried out during 2 years of joint efforts between the Center for Vaccine Development (Centro para Vacunas en Desarrollo) of Chile and PAHO's Division of Vaccines and Immunization. During those 2 years, the two groups encouraged the epidemiological study of bacterial pneumonias in Latin American children, using internationally accepted criteria and definitions as well as tools and practical solutions adapted to the reality of the Region of the America. The activities carried out so far show both the need for and the feasibility of standardizing the interpretation of chest radiographs so that they can be used in epidemiological studies. PMID:12831433

Lagos, Rosanna; di Fabio, José Luis; Moënne, Karla; Muñoz M, Alma; Wasserman, Steven; de Quadros, Ciro



A heterotrinuclear and a polynuclear complex constructed from a ferrocenyl carboxylate and an N-containing ligand: Synthesis, crystal structures and electrochemical properties  

Microsoft Academic Search

Treatment of NaO2CCHC(Me)Fc with cadmium acetate and iron(II) sulfate in the presence of 2,2?-bipy yielded [Cd2Fe(?-O2CCHC(Me)Fc)2(?2-O2CCHC(Me)Fc)2(?2-?2-O2CCHC(Me)Fc)2(2,2?-bipy)2]·2H2O (1); while from NaO2CC6H4{C(O)Fc-o}, cadmium acetate, and pbbm the product was {[Cd(?2-O2CC6H4{C(O)Fc-o})2(pbbm)]·0.5H2O}n (2) [Fc=(?5-C5H5)Fe(C5H4-?5); 2,2?-bipy=2,2?-bipyridyl; pbbm=1,1?-(1,5-pentamethylene)bis-1H-benzimidazole]. Compounds 1 and 2 have been characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. In centro-symmetric crystalline 1, the Fe and the two flanking atoms

Zifeng Li; Jiabin Li; Gang Li; Fuwei Zhang; Jingxia Wu; Gailing Bao



A psychology of liberation for central america: the unfinished work of ignacio martín-baró (1942-1989).  


On November 16, 1989 the world was shocked by the news of the assassination of six Jesuits at the campus of the Universidad Centro Americana José Simeón Cañas (UCA) in San Salvador, El Salvador. Among those murdered by government soldiers was Ignacio Martín-Baró, a PhD in social psychology from the University of Chicago who at that time was the Vice-Rector for Academic Affairs and Vice-President of the Interamerican Society of Psychology (SIP). Drawing on Martín-Baró's published writings and non-published academic papers and correspondence, this article traces the evolution of the Spanish-born Jesuit who became a leading authority among Latin American social psychologists. In particular, it analyzes his project of becoming a clinical psychologist under the influence of psychoanalysis, his critical social psychology aimed to "de-ideologize" the oppressed social classes of El Salvador, and his ultimate project of a psychology of liberation for Latin America. Martín-Baró's work came to a tragic end just when it began to bear fruit, but it stands as a testimony to a lifetime committed to the human values of democracy, social justice and service to society's poorest and most neglected. PMID:23866226

Gondra, José María



Radiocarbon dating of archaeological samples (sambaqui) using CO(2) absorption and liquid scintillation spectrometry of low background radiation.  


Sambaqui means, in the Tupi language, a hill of shells. The sambaquis are archaeological sites with remains of pre-historical Brazilian occupation. Since the sambaqui sites in the Rio de Janeiro state region are older than 10,000 years, the applicability of CO(2) absorption on Carbo-sorb and (14)C determination by counting on a low background liquid scintillation counter was tested. In the present work, sambaqui shells were treated with H(3)PO(4) in a closed vessel in order to generate CO(2). The produced CO(2) was absorbed on Carbo-sorb. On saturation about 0.6g of carbon, as CO(2), was mixed with commercial liquid scintillation cocktail (Permafluor), and the (14)C activity determined by counting on a low background counter, Packard Tricarb 3170 TR/SL, for a period of 1000 mins to enable detection of a radiocarbon age of 22,400 BP. But only samples with ages up to 3500 BP were submitted to the method because the samples had been collected in the municipality of Guapimirim, in archaeological sambaqui-type sites belonging to this age range. The same samples were sent to the (14)C Laboratory of the Centro de Energia Nuclear na Agricultura (CENA/USP) where similar results were obtained. PMID:16630675

Mendonça, Maria Lúcia T G; Godoy, José M; da Cruz, Rosana P; Perez, Rhoneds A R



Science and technology disclosure in the state of Queretaro: Science and Technology for Children program  

NASA Astrophysics Data System (ADS)

Science and technology disclosure is an integral part of our scientific work as researches; it is an induction process for children, young people and teachers of primary and secondary schools in the state of Queretaro. Education must be offered in a clear and objective way, it allows to the students apply the acquired knowledge to understand the world and improve his quality of life. Nowadays, the Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada of the Instituto Politecnico Nacional Unidad Queretaro (CICATA-IPN Queretaro) together with the Consejo de Ciencia y Tecnologia del Estado de Queretaro (CONCYTEQ) have implemented the "Science and Technology for Children" program (Ciencia y Tecnologia para Ninos - CTN), it allows to the educative sector obtain information through the CONCYTEQ web page. The fist stage of the program was the development of two subjects: the brochure titled "Petroleum, Nonrenewable Natural Resource that Moves the World" and the manual "Experiments of Physics". At the moment we are working with the second stage of the program, it is about the energy generation using renewable sources such as: geothermal, aeolian, solar and biomass. The CTN program allows to students and teachers to create conscience about the importance of the development of the science of technology in our country.

Contreras Flores, Rubén; Villeda Muñoz, Gabriel



FReDNet: a Continuous GPS Geodetic Network Monitoring Crustal Deformation in NE Italy  

NASA Astrophysics Data System (ADS)

The Friuli Regional Deformation network (FReDNet) of continuously operating Global Positioning System (GPS) receivers monitors crustal deformation in the Friuli area and the northeast boundary of the Adriatic microplate. The Friuli area, located within the active collision zone between Eurasia and the Adriatic block, is characterized by one of the strongest clusters of seismic activity in the Adriatic microplate. Relative motions of the Adriatic block and deformation across the Friuli region are on the order of 5 mm/yr. The principal goals of the FReDNet program are to determine the distribution of deformation in this region and to estimate interseismic strain accumulation on its active faults to better assess seismic hazards. FReDNet is operated by the Centro Ricerche Sismologiche (CRS) of the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS. We began to install the initial 6 stations of FReDNet in the summer of 2002. To integrate geodetic and seismic data, we plan to co-locate some GPS stations with broadband seismometers maintained by the OGS. FReDNet is part of a larger program of geodetic monitoring of the Adriatic microplate that includes repeating episodic measurements of geodetic points (e.g., points of the IGM95 geodetic network). The data and experience acquired through the FReDNet program will allow the OGS to monitor hazardous faults for emergency response management, and provide infrastructures for geodetic data management and processing.

Zuliani, D.; Battaglia, M.; Murray, M.; Michelini, A.; Burgmann, R.; Marson, I.



Sleep Apnea in Patients with Acromegaly. Frequency, Characterization and Positive Pressure Titration  

PubMed Central

Objectives: to describe the frequency of sleep apnea in patients with acromegaly;to identify the proportion of candidates for treatment with positive airway pressure;to report our experience with the positive pressure titration process in acromegaly patients. Methods: A cross-sectional study that included the acromegaly cohort at the Centro Medico Nacional “20 de Noviembre” in Mexico City (n=44). A standard polysomnography (PSG) was carried out for each patient. A second PSG was done for purposes of CPAP titration. Results: A total of 35 patients were studied (80% of the cohort, 20 [57%] women). Polysomnography results showed that 34 subjects (97%, 95%CI 91-100%) had apnea hypopnea indexes (AHI) ? 5. No patient had central apnea. We identified 19 subjects with AHI ?5 and Epworth ?10, for a frequency of obstructive sleep apnea syndrome of 54% (95%CI 36-71%). A total of 31 patients (88%; 95%CI 77-99%) were deemed to be candidates for positive pressure treatment, but only 8 of them accepted CPAP. They required pressures that ranged from 10 to 18 cmH2O. Conclusions: Our results confirm a high prevalence of sleep apnea in patients with acromegaly, and provide evidence that the majority of those patients are candidates for treatment with positive pressure. Contrary to what has been reported, we identified no patients with central apnea.

Hernandez-Gordillo, Daniel; Ortega-Gomez, Maria del Rocio; Galicia-Polo, Lourdes; Castorena-Maldonado, Armando; Vergara-Lopez, Alma; Guillen-Gonzalez, Miguel Angel; Torre-Bouscoulet, Luis



Screening of congenital cytomegalovirus infection by real-time PCR in urine pools.  


Human cytomegalovirus (HCMV) is the most frequent cause of congenital infection. Despite the fact that 5-17% of asymptomatic infected babies will develop late sequelae and, therefore, should be closely followed, most of these children will remain undetected, as screening of all newborns by viral culture is too expensive and no valid alternative has been widely accepted. The aim of this work was to demonstrate that pool testing can be used to screen HCMV congenital infection in newborns. For this purpose, a real-time PCR technique was tested in urine pools. This pool method was applied to all urine specimens from children received in the virology laboratory of the Centro Hospitalar Cova da Beira for diagnosis of HCMV infection for a period of 14 months. Ten out of the 160 urine samples were tested positive by shell-vial culture and were also detected by this pool method. Additionally, 100 urine specimens, collected in 2004 and culture negative for HCMV were included to test the specificity of this methodology, all of which were negative. In conclusion, these results suggest that urine pools can be used to detect HCMV-positive urines in children, with similar sensitivity and specificity when compared with the standard method. Because of the very significant reduction both in terms of labour and cost of testing materials, this methodology may represent a valid option for screening the HCMV congenital infection in newborns. PMID:21614511

Paixão, Paulo; Almeida, Sofia; Videira, Paula A; Ligeiro, Dário; Marques, Teresa



The state of psychiatry in Spain.  


The 1986 General Health Act and the so-called 'psychiatric reform' were key issues in the development of the mental healthcare system (MHCS) in Spain. The World Health Organization Declaration and Action Plan on Mental Health in 2005 gave it a revitalizing impetus and resulted in the first National Health System (NHS) Mental Health Strategy in 2006. A literature search was performed using MEDLINE, Spanish journals, reference lists, national databases, and European and Spanish official documents to describe the current state of the MHCS in Spain. The main results were: (1) existence of great variability among the autonomous communities with respect to mental health resources and provision of care; (2) lack of national epidemiological information on mental disorders with the exception of substance use disorders and suicide, which comprise powerful longitudinal national data, (3) training in psychiatry is well established, although there is no specialism of child and adolescent psychiatry, and (4) a dramatic increase in scientific productivity in the last decade among research groups, in part due to the creation of the Spanish Mental Health Network, the Centro de Investigación Biomédica en Red en el Área de Salud Mental (CIBERSAM). Quantifiable and reliable indicators are needed to provide efficient monitoring and analysis of epidemiological events and subsequently to understand the status of the Spanish MHCS. PMID:22950775

Bobes, Julio; Garcia-Portilla, Maria Paz; Bobes-Bascaran, Maria-Teresa; Parellada, Mara; Bascaran, Maria-Teresa; Saiz, Pilar Alejandra; Bousoño, Manuel; Arango, Celso



Helical Tomotherapy in Children and Adolescents: Dosimetric Comparisons, Opportunities and Issues  

PubMed Central

Helical Tomotherapy (HT) is a highly conformal image-guided radiation technique, introduced into clinical routine in 2006 at the Centro di Riferimento Oncologico Aviano (Italy). With this new technology, intensity-modulated radiotherapy (IMRT) is delivered using a helicoidal method. Here we present our dosimetric experiences using HT in 100 children, adolescents and young adults treated from May 2006 to February 2011. The median age of the patients was 13 years (range 1–24). The most common treated site was the central nervous system (50; of these, 24 were craniospinal irradiations), followed by thorax (22), head and neck (10), abdomen and pelvis (11), and limbs (7). The use of HT was calculated in accordance to the target dose conformation, the target size and shape, the dose to critical organs adjacent to the target, simultaneous treatment of multiple targets, and re-irradiation. HT has demonstrated to improve target volume dose homogeneity and the sparing of critical structures, when compared to 3D Linac-based radiotherapy (RT). In standard cases this technique represented a comparable alternative to IMRT delivered with conventional linear accelerator. In certain cases (e.g., craniospinal and pleural treatments) only HT generated adequate treatment plans with good target volume coverage. However, the gain in target conformality should be balanced with the spread of low-doses to distant areas. This remains an open issue for the potential risk of secondary malignancies (SMNs) and longer follow-up is mandatory.

Mascarin, Maurizio; Giugliano, Francesca Maria; Coassin, Elisa; Drigo, Annalisa; Chiovati, Paola; Dassie, Andrea; Franchin, Giovanni; Minatel, Emilio; Trovo, Mauro Gaetano



Determination of nitrogen in metallic phases using the 14N(d, p/?)15N nuclear reaction  

NASA Astrophysics Data System (ADS)

Analysis of nitrogen in metallic materials using X-ray spectrometry (EDS, PIXE) is subjected to large errors due to two factors: the low nitrogen contents in the steels (usually below 0.3 wt.%) and the presence of interfering L-lines of the main metallic components (Fe, Cr, Ni,/...). These factors prevent the use of SEM, TEM, micro-PIXE and other microanalytical techniques for the quantitative determination of nitrogen in metallic phases, non-metallic inclusions, precipitates, etc. In this case the deuteron induced gamma-ray emission (DIGE or d-PIGE) is known to be a very suitable method. In this work we describe the methodology for the use of the 14N(d, p/?)15N nuclear reaction at a deuteron energy of 1.4 MeV to measure low nitrogen levels in steel, using both macro and microbeam analysis. DIGE experiments were performed in the universal chamber and in the scanning nuclear microprobe at the Centro Nacional de Aceleradores in Seville, using steel standards with nitrogen contents ranging between 0.008 and 0.35 wt.%. These results give a value for the detection limits for nitrogen in the steels of 0.001 wt.% for the macrobeam and 0.04 wt.%. for the microbeam. Results are applied, in combination with d-PIXE (or DIXE), RBS and electron imaging to the determination of the nitrogen partitioning ratio between /?-Fe and /?-Fe in an austenitic-ferritic duplex stainless steel.

Ager, F. J.; Elmrabet, S.; Paúl, A.; Cea-Naharro, Á.; Ynsa, M. D.; Respaldiza, M. A.; Odriozola, J. A.



Progress in the development of MANIC: a monolithic nulling interferometer for characterizing extrasolar environments  

NASA Astrophysics Data System (ADS)

We present progress in the development of the monolithic achromatic nulling interference coronagraph (MANIC), an optic designed for enabling direct detection and characterization of exoplanetary systems around nearby stars. MANIC is a fully symmetric implementation of a rotational shearing interferometer consisting of fused quartz prisms and a symmetric beamsplitter optically contacted in an arrangement that geometrically flips the fields in the TR and RT arms about orthogonal axes such that upon recombination, a centro-symmetric, theoretically achromatic null is produced. In addition to a small inner working angle (<~ 1?/D), built-in alignment and stability are inherent benefits of the compact monolithic design, which make MANIC a competitive alternative to conventional discrete element nullers proposed for imaging exoplanetary environments. Following MANIC's initial fabrication, the path error between its TR and RT arms was measured. This measurement was used to fabricate compensator plates of varying thicknesses that were bonded to the optic to reduce dispersion imbalance, thereby improving broadband nulling performance. In performing this correction, initial OPD was reduced from 949 +/- 44 nm to 63 +/- 10 nm, which in the absence of any other asymmetries, corresponds to an increase in a 107 R-band (?c = 648 nm) nulling bandpass from monochromatic to 25%, or at the 106 level, from 5% to 50%. Current benchtop laser and polychromatic nulling strategies are described. The potential science return from using MANIC on a sub-orbital platform is discussed.

Hicks, Brian A.; Cook, Timothy A.; Lane, Benjamin F.; Chakrabarti, Supriya



Using Simultaneous SHG and XRD Capabilities to Examine Phase Transitions of HMX and TATB  

SciTech Connect

Simultaneous SHG (second harmonic generation) and XRD (x-ray diffraction) capabilities have been developed at SSRL (Stanford Synchrotron Radiation laboratory) to examine the phase behavior of energetic materials, for example, HMX (octahydro- 1,3,5,7-tetranitro- 1,3,5,7-tetrmcine) and TATB (1,3,5-triamino-2,4,6 trinitrobenzene). This unique capability provides information on the evolution at the molecular level (centro and non-centrosymmetric) on material stability, phase transformation or decomposition reactions, which are important to continue refinement of computational predictions of material properties. This paper reports x-ray diffraction experiments on both HMX and TATB with increasing temperature and on simultaneous SHG and XRD experiments at fixed temperature. Our results indicate that, for HMX, the {beta} to {delta} transformation occurs over a range of temperature which do not correlate to the previously reported fast rise in SHG signal close to 17OOC as a phase transformation. No phase transition is observed for TATB, even though, previous paper shows an increase in the SHG signal.

Saw, C K; Zaug, J; Farber, D; Ruddle, C



Metal oxide layer influence on the sensitivity of SPR fiber optic sensor  

NASA Astrophysics Data System (ADS)

A model of surface plasmon resonance fiber optic sensor operated in spectral domain is presented. The sensing scheme is based on a multimode optical fiber whose core is covered by thin silver film. Theoretical description of the proposed fiber optic structure is carried out in the frame of multilayer optic approximation. For the sake of clarity, the excitation by collimated centro-symmetric beam focused on the sensing fiber axis is supposed and only the propagation of meridional rays is considered. The contribution of s and p-polarization is included in the computation, however only p-polarization is affected by surface plasmon resonance phenomenon. The optical dispersion of all involved materials is taken into account. It is known that the usage of silver surface plasmon resonance detection layer leads to narrower dip (comparing to gold layer) and higher sensitivity, but the chemical stability of silver is the potential problem. The solution to this problem can be the creation of oxide overlayer on the top of the surface plasmon resonance detection layer. The effect of the overlayer thickness on the performance of the sensor is analyzed in detail using numerical simulation and discussed in terms of sensitivity and detection accuracy.

Ciprian, Dalibor; Hlubina, Petr



[Molecular typification of Pseudomonas aeruginosa strains isolated from patients with cystic fibrosis].  


Cystic fibrosis is the most frequent lethal genetic disease that affects the caucasian population. The main cause of morbidity is the chronic lung infection, being the infection caused by Pseudomonas aeruginosa the most difficult to eradicate. This bacteria can be acquired in direct form, by person-to-person transfer, or indirectly, by hospital acquired infection. The Centro Provincial de Referencia de Fibrosis Quistica functioning in the Hospital de Niños "Sor María Ludovica", in La Plata, cares almost 220 patients aged two months to 45 years. The life expectancy depends of factors like the early diagnosis of the disease and the later acquisition of the chronic lung infection. The purpose of this work was the molecular typing of P. aeruginosa isolates obtained from cystic fibrosis patients to evaluate the genomic relationship among them. The study was carried out using RAPD-PCR. The analysis showed a great genetic heterogeneity among the isolates. The separation of the patients in groups in accordance with its bacteriology, that implies the attendance in different days and the implementation of isolation (or segregation) measures had demonstrated to be, in addition to other strategies, effective in the reduction of cross infections. PMID:18669045

Iglesias, N G; Marengo, J M; Rentería, F; Gatti, B; Segal, E; Semorile, L


Doppler imaging of the young late-type star LO Pegasi (BD+22°4409) in 2003 September  

NASA Astrophysics Data System (ADS)

A Doppler image of the zero-age main-sequence (ZAMS) late-type rapidly rotating star LO Pegasi, based on spectra acquired between 2003 September 12 and 15 is presented. The least-squares deconvolution technique is applied to enhance the signal-to-noise ratio of the mean rotational broadened line profiles extracted from the observed spectra. In the present application, an unbroadened spectrum is used as a reference, instead of a simple line list, to improve the deconvolution technique applied to extract the mean profiles. The reconstructed image is similar to those previously obtained from observations taken in 1993 and 1998, and shows that LO Peg photospheric activity is dominated by high-latitude spots with a non-uniform polar cap. The latter seems to be a persistent feature as it has been observed since 1993 with little modifications. Small spots, observed between ~10° and ~60° of latitude, appears to be different with respect to those present in the 1993 and 1998 maps. Based on observations made with the Italian Telescopio Nazionale Galileo operated on the island of La Palma by the Centro Galileo Galilei of INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque del los Muchachos of the Instituto de Astrofísica de Canarias. E-mail: (NP); (AFL); (IP); (ACL); (J-FD)

Piluso, N.; Lanza, A. F.; Pagano, I.; Lanzafame, A. C.; Donati, J.-F.



Determination of nitrogen partitioning coefficients in superduplex stainless steels by NRA using a nuclear microprobe  

NASA Astrophysics Data System (ADS)

Superduplex stainless steels (SDSSs) combine the good mechanical behavior and the high corrosion resistance of the ferrite (?-Fe) and austenite (?-Fe) phases. The SDSSs properties depend strongly on the partitioning of the elements that form the alloy. The ferrite is generally enriched in P, Si, Cr and Mo while the content of Ni, Mn, Cu and N in the austenite phase is higher. Nitrogen is known to be a strong austenite stabilizer and its presence increases the strength and the pitting corrosion resistance of the stainless steels. While the global nitrogen content in SDSSs can be readily determined using elemental analyzers, it cannot be measured at a microscopic scale. In this work, the nuclear microprobe of the Centro Nacional de Aceleradores (Sevilla) was used to obtain the quantitative distribution of nitrogen in SDSSs. A deuteron beam of 1.8 MeV was employed to determine the overall elemental concentration of the matrix by deuteron-induced X-ray emission, whereas the nitrogen partitioning coefficients were obtained by using the 14N(d, ?0)12C nuclear reaction. Mappings of this element show that the nitrogen ratio between the ferrite and austenite phases ranges from 0.3 to 0.6 in the analyzed samples.

Muñoz, C.; Morilla, Y.; García López, J.; Paúl, A.; Odriozola, J. A.



Efficiency of three diets for larval development in mass rearing Aedes albopictus (Diptera: Culicidae).  


A fundamental step in establishing a mass production system is the development of a larval diet that promotes high adult performance at a reasonable cost. To identify a suitable larval diet for Aedes albopictus (Skuse), three diets were compared: a standard laboratory diet used at the Centro Agricoltura Ambiente, Italy (CAA) and two diets developed specifically for mosquito mass rearing at the FAO/IAEA Laboratory, Austria. The two IAEA diets, without affecting survival to the pupal stage, resulted in a shorter time to pupation and to emergence when compared with the CAA diet. At 24 h from pupation onset, 50 and 90% of the male pupae produced on the CAA and IAEA diets, respectively, had formed and could be collected. The diet received during the larval stage affected the longevity of adult males with access to water only, with best results observed when using the CAA larval diet. However, similar longevity among diet treatments was observed when males were supplied with sucrose solution. No differences were observed in the effects of larval diet on adult male size or female fecundity and fertility. Considering these results, along with the relative costs of the three diets, the IAEA 2 diet is found to be the preferred choice for mass rearing of Aedes albopictus, particularly if a sugar meal can be given to adult males before release, to ensure their teneral reserves are sufficient for survival, dispersal, and mating in the field. PMID:23926780

Puggioli, Arianna; Balestrino, F; Damiens, D; Lees, R S; Soliban, S M; Madakacherry, O; Dindo, M L; Bellini, R; Gilles, J R L



Diagnosis of Neospora caninum in bovine fetuses by histology, immunohistochemistry, and nested-PCR.  


Neospora caninum, a cause of abortion and stillbirth in cattle, was studied by histology, immunohistochemistry, and nested-PCR, using primers from the Nc5 region of the genomic DNA (PCR PLUS) and primers from the ITS1 region of the ribosomal DNA (PCR JB). A total of 105 fetal samples sent to the Centro de Pesquisa e Desenvolvimento de Sanidade Animal do Instituto Biológico from January 2006 to May 2008 were examined for evidence of N. caninum. Histological examination revealed 71.4% with non-suppurative inflammation in the heart, lung, liver, kidney, placenta, and brain. Immunohistochemistry detected infections in 8.6% of the samples, mainly in the brain, placenta, and heart. Nested-PCR JB revealed 6.7% with infections, while nested-PCR PLUS returned 20.9% positive results, mainly in brain and placenta, and in the pooled liver and heart. Kappa statistics demonstrated little agreement among the three techniques. The three methods are complementary, since they have distinct diagnostic characteristics and were combined to give a positivity rate of 24.8%. PMID:20040203

Cabral, Aline Diniz; Camargo, Clarice Neves; Galleti, Nara Thiers Cacciatori; Okuda, Liria Hiromi; Pituco, Edviges Maristela; Fava, Claudia Del


A review of primary hereditary optic neuropathies.  


The primary inherited optic neuropathies are a heterogeneous group of disorders that result in loss of retinal ganglion cells, leading to the clinical appearance of optic atrophy. They affect between 1:10,000 to 1:50,000 people. The main clinical features are a reduction in visual acuity, colour vision abnormalities, centro-caecal visual field defects and pallor of the optic nerve head. Electrophysiological testing shows a normal flash electroretinogram, absent or delayed pattern visually evoked potentials suggestive of a conduction deficit and N95 waveform reduction on the pattern electroretinogram, consistent with a primary ganglion cell pathology. The primary inherited optic neuropathies may be sporadic or familial. The mode of inheritance may be autosomal dominant, autosomal recessive, X-linked recessive or mitochondrial. Within each of these groups, the phenotypic characteristics vary in such features as the mode and age of onset, the severity of the visual loss, the colour deficit and the overall prognosis. A number of different genes (most as yet unidentified) in both nuclear and mitochondrial genomes, underlie these disorders. The elucidation of the role of the encoded proteins will improve our understanding of basic mechanisms of ganglion cell development, physiology and metabolism and further our understanding of the pathophysiology of optic nerve disease. It will also improve diagnosis, counselling and management of patients, and eventually lead to the development of new therapeutic modalities. PMID:12889662

Votruba, M; Aijaz, S; Moore, A T



DFT calculations and vibrational (FT-IR, FT-Raman) spectra on an uracilyl-pyridinium salt  

NASA Astrophysics Data System (ADS)

In the present article we have studied the structural and vibrational properties of the N-protonated derivative of a cross-conjugated heterocyclic mesomeric betaine formed by an uracilyl and a dimethylamino substituted pyridinium group. Fourier transform infrared and Raman spectra were recorded from solid samples. Quantum chemistry density functional theory calculations were performed at the B3PW91/6-31G?? level. Geometrical parameters, charge distribution and natural bond orders were calculated for the ground-state minimum energy structure. The optimized geometry was found twisted with respect to the two aromatic planes. The pyridinium ring presents a quinoid structure, while the uracilyl ring only presents a localized double-bond, which is far from the carbonyl groups. The molecule is strongly polar along the longest molecular axis, being largely originated by the charge separation between the heterocycles. A force field and normal coordinate calculation was performed in order to correctly assign the measured infrared and Raman bands. Assignments suggest the existence of centro-symmetrical structures in solid state bonded by the CO and N H groups of the uracilyl ring. The calculated force constants in vibrational internal coordinates are in agreement with the structural parameters.

Schmidt, A.; Lindner, A. S.; Ramírez, F. J.



Identification of irradiated wheat by germination test, DNA comet assay and electron spin resonance  

NASA Astrophysics Data System (ADS)

In several countries, there has been an increase in the use of radiation for food processing thus improving the quality and sanitary conditions, inhibiting pathogenic microorganisms, delaying the natural aging process and so extending product lifetime. The need to develop analytical methods to detect these irradiated products is also increasing. The goal of this research was to identify wheat irradiated using different radiation doses. Seeds were irradiated with a gamma 60Co source (Gammacell 220 GC) in the Centro de Energia Nuclear na Agricultura and the Instituto de Pesquisas Energéticas e Nucleares. Dose rate used were 1.6 and 5.8kGy/h. Applied doses were 0.0, 0.10, 0.25, 0.50, 0.75, 1.0, and 2.0kGy. After irradiation, seeds were analysed over a 6 month period. Three different detection methods were employed to determine how irradiation had modified the samples. Screening methods consisted of a germination test measuring the inhibition of shooting and rooting and analysis of DNA fragmentation. The method of electron spin resonance spectroscopy allowed a better dosimetric evaluation. These techniques make the identification of irradiated wheat with different doses possible.

Barros, Adilson C.; Freund, Maria Teresa L.; Villavicencio, Ana Lúcia C. H.; Delincée, Henry; Arthur, Valter



Dopamine Inactivation Efficacy Related to Functional DAT1 and COMT Variants Influences Motor Response Evaluation  

PubMed Central

Background Dopamine plays an important role in orienting, response anticipation and movement evaluation. Thus, we examined the influence of functional variants related to dopamine inactivation in the dopamine transporter (DAT1) and catechol-O-methyltransferase genes (COMT) on the time-course of motor processing in a contingent negative variation (CNV) task. Methods 64-channel EEG recordings were obtained from 195 healthy adolescents of a community-based sample during a continuous performance task (A-X version). Early and late CNV as well as motor postimperative negative variation were assessed. Adolescents were genotyped for the COMT Val158Met and two DAT1 polymorphisms (variable number tandem repeats in the 3?-untranslated region and in intron 8). Results The results revealed a significant interaction between COMT and DAT1, indicating that COMT exerted stronger effects on lateralized motor post-processing (centro-parietal motor postimperative negative variation) in homozygous carriers of a DAT1 haplotype increasing DAT1 expression. Source analysis showed that the time interval 500–1000 ms after the motor response was specifically affected in contrast to preceding movement anticipation and programming stages, which were not altered. Conclusions Motor slow negative waves allow the genomic imaging of dopamine inactivation effects on cortical motor post-processing during response evaluation. This is the first report to point towards epistatic effects in the motor system during response evaluation, i.e. during the post-processing of an already executed movement rather than during movement programming.

Bender, Stephan; Rellum, Thomas; Freitag, Christine; Resch, Franz; Rietschel, Marcella; Treutlein, Jens; Jennen-Steinmetz, Christine; Brandeis, Daniel; Banaschewski, Tobias; Laucht, Manfred



Assessment of plantar pressure and balance in patients with diabetes  

PubMed Central

Introduction Patients with diabetes for more than 10 years may have an increase in peak plantar pressure, considerable postural oscillation, balance deficit, alterations in gait pattern and an increased risk of falls. The aim of the present study was to assess the correlation between plantar pressure distribution and balance in patients with diabetes using a pressure platform (Footwork). Material and methods The study was carried out at the Human Movement Clinic of the Centro Universitário de Belo Horizonte (Brazil). The sample was made up of 18 right-handed individuals with type 2 diabetes – 14 females and 4 males – with an average age of 58.72 ±9.54 and an average of 18.56 ±6.61 years since diagnosis. Result Data analysis revealed that greater peak plantar pressure on the right hindfoot led to greater radial displacement (Rd) (r = 0.2022) and greater displacement velocity (r = 0.2240). Greater peak plantar pressure on the left hindfoot also led to greater displacement velocity (P) (r = 0.5728) and radial displacement (RD) (r = 0.1972). A positive correlation was found between time elapsed since diagnosis and peak midfoot pressure (r = 0.3752) on the right and left side as well as between BMI and plantar pressure on all regions of the foot. Conclusions The data reveal a correlation between postural oscillation and peak plantar pressure on the hindfoot.

Anjos, Daniela M.C.; Gomes, Luciana P.O.; Sampaio, Luciana M.M.; Correa, Joao C.F.



Liquefaction during the 1981 and previous earthquakes near Westmorland, California  

SciTech Connect

A 1981 earthquake generated liquefaction and other secondary ground effects at many localities within a 150 km/sup 2/ area north of Westmorland, California. Surface effects of liquefaction, including sand soils, fissures, slumps, lateral spreads, and ground settlement, spotted fields with sand and disrupted fields, roads, and canals with fissures and scarps. We specifically describe 22 localities where effects or damage were pronounced during the 1981 event. Similar effects were noted within or near this area after earthquakes in 1930, 1950, 1957, and 1979. The 1940 El Centro event also severely shook the area and could have produced ground effects that were unobserved or unreported. Secondary ground effects in this region have developed only in areas of late Holocene sedimentation, primarily areas inundated by 1905-1906 flooding from the New and Alamo Rivers and the concurrent rise of the Salton Sea. Sediment that liquefied during the 1930, 1950, 1957 and 1981 earthquakes are similar in mode of deposition and age to those that have been most susceptible to liquefaction in other parts of the world. All except one of the 1981 liquefaction sites were within a horizontal distance of 7 km from a surface projection of the estimated zone of seismic energy release. The one exception was slight rejuvenation of several sand boils that had previously erupted during the 1979 Imperial Valley earthquake. These sand boils were 12 km from the source zone. The distances agree well with similar distances measured in other parts of the world. 14 refs., 16 figs.

Youd, T.L.; Wieczorek, G.F.



Vibrational spectra and non linear optical proprieties of L-histidine oxalate: DFT studies  

NASA Astrophysics Data System (ADS)

This paper presents the results of our calculations on the geometric parameters, vibrational spectra and hyperpolarizability of a nonlinear optical material L-histidine oxalate. Due to the lack of sufficiently precise information on geometric structure in literature, theoretical calculations were preceded by re-determination of the crystal X-ray structure. Single crystal of L-histidine oxalate has been growing by slow evaporation of an aqueous solution at room temperature. The compound crystallizes in the non-Centro symmetric space group P2 12 12 1 of orthorhombic system. The FT-IR and Raman spectra of L-histidine oxalate were recorded and analyzed. The vibrational wave numbers were examined theoretical with the aid of Gaussian98 package of programs using the DFT//B3LYP/6-31G(d) level of theory. The data obtained from vibrational wave number calculations are used to assign vibrational bands obtained in IR and Raman spectroscopy of the studied compound. The geometrical parameters of the title compound are in agreement with the values of similar structures. To investigate microscopic second order non-linear optical NLO behaviour of the examined complex, the electric dipole ?tot, the polarizability ?tot and the hyperpolarizability ?tot were computed using DFT//B3LYP/6-31G(d) method. According to our calculation, the title compound exhibits non-zero ?tot value revealing microscopic second order NLO behaviour.

Ahmed, A. Ben; Elleuch, N.; Feki, H.; Abid, Y.; Minot, C.



[Characterization of Cryptococcus neoformans strains isolated from patients with acquired immunodeficiency syndrome (AIDS)].  


In Mexico cryptococosis ranks third in frequency among the mycoses ocurring as complications in AIDS patients. Neither the prevalence of the two varieties of C. neoformans in these patients nor the morphological and physiological changes suffered by these strains in AIDS patients are known. A total of 60 isolates were obtained from patients with AIDS from the Hospital de Infectología, Centro Médico "La Raza" IMSS. The identity of each isolate was established by: growth at 37 degrees C, colony and microscopic characteristics, urease and phenoloxidase activity, carbon sources assimilation. The canavanine glycine-bromothymol blue agar was used to distinguish C. neoformans var. neoformans and C. neoformans var. gattii. Pathogenicity in mice was also tested. Fifty one isolates of C. neoformans var. neoformans and nine of C. neoformans var. gattii were identified. All strains grew well at 37 degrees C, urease and phenoloxidase were positive, the morphology and the auxanographic profile were variable. C. neoformans var. neoformans was more virulent in mouse than C. neoformans var. gattii. This study has confirmed the presence of the two varieties of C. neoformans in Mexico with 85% prevalence of var. neoformans and 15% of var. gattii in AIDS patients. This frequency was higher than in reports from other countries. PMID:8850346

Garza-Garza, D; Buendía-Uribe, J L; Martínez-Cruz, E; Argüero-Licea, B


[Challenging fears: reports of users coping with phobic-anxious disorders].  


This is an interpretative and comprehensive study that aimed to investigate ways of coping used by patients with phobic-anxious disorders, attended at the Centro de Atenção Psicossocial I, of the municipality of Queimadas, state of Paraíba, Brazil, in the period from October to December 2010. The empirical data were obtained through interviews and subjected to content analysis. From this material were extracted the main themes that formed the thematic category called CAPS I as a space to expression of subjectivity, and the thematic axis: Recognition of the illness; Loneliness and isolation; and Family as the primary point of support. The results showed that, while adhering to treatment, users began to recover their self-esteem, strengthen bonds and to deal with the bio psychosocial symptoms. We emphasize the importance of the affective dimension in the encounter between professionals, patients and families. It can be concluded that the humanized practice ensures and stimulates the integration between the work processes and the users' life projects. PMID:24008706

Almeida, Priscylla Araújo; Silva, Priscilla Maria de Castro; Espínola, Lawrencita Limeira; de Azevedo, Elisângela Braga; Ferreira Filha, Maria de Oliveira


The guava tree as bioindicator during the process of fuel replacement of an oil refinery.  


This study was performed to verify whether the exchange of the fuel used in the boilers of a crude oil refinery located in Cubatão (SE Brazil) would result in alterations on gas exchange, growth and leaf injuries in saplings of Psidium guajava 'Paluma'. The purpose of the refinery was to reduce the SO2 emission, but using natural gas as fuel could increase the concentrations of O3 precursors in the atmosphere. Thus a biomonitoring was performed with a native species sensitive to O3. The plants were exposed in five areas (CM1, CM5, CEPEMA, Centro, and RP) at different distances to the refinery, both before and after the fuel exchange. We performed six exposures under environmental conditions, with length of ca. 90 days each. With the utilization of natural gas, the saplings presented reductions in carbon assimilation rate under saturating light conditions (Asat, ?molCO2m(-2)s(-1)) and the stomatal conductance (gs, molH2Om(-2)s(-1)), and increase in height, number of leaves, and dry mass of leaves and shoots. There were also reductions in root dry mass and in the root/shoot ratio. The saplings also presented O3-induced leaf injuries. The responses of P. guajava 'Paluma' were altered after the fuel exchange as a result of a new combination of pollutants in the atmosphere. The fuel exchange has not resulted in environmental benefit to the surrounding forest; it has only altered the contamination profile of the region. PMID:23391563

Silva, Simone F; Meirelles, Sérgio T; Moraes, Regina M



A study of 159 Portuguese patients with familial amyloidotic polyneuropathy (FAP) whose parents were both unaffected.  

PubMed Central

We reviewed 1233 cases of familial amyloidotic polyneuropathy (FAP) from 489 Portuguese families registered at the Centro de Estudos de Paramiloidose, Porto, Portugal. It was found that in 159 cases, neither parent had shown symptoms of this hereditary dominant form of peripheral neuropathy. These cases appear to form a distinct group, with a later age at onset (mean 45.1 years, SD 12.0) than the group of patients with one affected parent (mean 31.2 years, SD 6.9) and a geographical origin not quite in the areas where the disease is most prevalent. Though this group is not significantly different from the general group of patients in clinical presentation at onset and severity of the disease, the average interval between onset and diagnosis (mean 4.5 years, SD 3.2) reflects the difficulties in diagnosing these patients in the absence of a positive family history. From the analysis of pedigrees and in spite of a large number of isolated cases, the occurrence of new mutations could not be proven, and it seems more likely that, in some families, the FAP gene may result in a milder expression or even remain "silent" for several generations. Further investigation of this discrepancy may prove to be important in elucidating the mechanisms involved in the pathogenetic process.

Coelho, T; Sousa, A; Lourenco, E; Ramalheira, J



Iterative atmospheric parameters estimation of the tropical atmosphere  

NASA Astrophysics Data System (ADS)

This work describes an iterative algorithm capable of determining the atmospheric parameters (temperature and water vapour profiles) by using NOAA ATOVS data and "in situ" observations currently collected at the Broglio Space Centre (BSC, located in Malindi-Kenya, 40 E, 3 S) of the Centro di Ricerca Progetto San Marco (CRPSM) of the University of Rome "La Sapienza" (Italy). The method is based on the usual approach to the problem of retrieving atmospheric characteristics: 1. a forward model (using the Modtran atmospheric code); 2. a numerical method for solving systems of non-linear equations (by means of a Broyden"s Quasi-Newton methods and a regularization method coupled with a preconditioning to computing stabilized solutions to the ill-posed problems). The retrieval method for the temperature and water vapour is discussed in detail; comparisons are also made with available co-located atmospheric information from balloon-based soundings. The aim of this paper is to evaluate the accuracy of the estimate of the tropical atmosphere parameters using a retrieval algorithm developed by authors, based on Broyden"s method for systems of non-linear equations.

Longo, Francesco; Laneve, Giovanni



Iterative atmospheric parameters estimationof the tropical atmospere  

NASA Astrophysics Data System (ADS)

This work describes an iterative algorithm capable of determining the atmospheric parameters (temperature, water vapor and ozone profiles) by using the observations currently collected at the BSC Station (Malindi -Kenya, 40° E, 3° S) of the Centro di Ricerca Progetto San Marco (CRPSM) of the University of Rome "La Sapienza" (Italy), by using the NOAA ATOVS data. The method is based on the usual approach to the problem of retrieving atmospheric characteristics:- a forward model (using the FASCODE atmospheric code);- a numerical method to find a solution (by means of the Least SquareEstimation (LSE), the Extended Kalman Filter (EKF) and a regularizationmethod for computing stabilized solutions to the ill-posed problems). Moreover, the retrieval method for the temperature, water vapor and ozone is discussed in detail; comparisons are also made with available co-located atmospheric informations from AAPP-ICI software and balloon based soundings. The aim of this paper is to evaluate the accuracy of the estimate of the tropical atmosphere parameters using an autonomous ret rieval algorithm, based on a modified LSE technique, introducing a gain computed from Kalman theory.

Longo, F.; Laneve, G.; Castronuovo, M.


Prevalence and factors associated with frailty among Peruvian older adults.  


The objective of this study is to examine the prevalence and factors associated with frailty in Peruvian Navy Veteran's older adults and family members. A total of 311 non-institutionalized men and women aged 60 years and older, from the Geriatrics Service of the Peruvian Navy Medical Center (Centro Médico Naval "Cirujano Mayor Santiago Távara") were assessed between May and October 2010. Frailty was defined as having two or more of the following components: (1) unintentional weight-loss, (2) weakness (lowest 20% in grip-strength), (3) self-reported exhaustion, and (4) slow walking speed (lowest 20% 8-m walk-time in seconds). Additionally, information on socio-demographic factors, medical conditions, depressive symptoms, disability, and cognitive function were obtained. Of the 311 participants, 78 (25.1%) were not frail, 147 (47.3%) were pre-frail, and 86 (27.8%) were frail. Using logistic regression analysis, we found that older age, being married, falls in the last year and disability were factors significantly associated with being frail. We conclude that prevalence of pre-frail and frail status in Peruvian Navy Veterans and family members is high. Our data reports risk factors for frailty that have been reported in the past in other population groups. A larger sample and longitudinal follow-up are needed to design and implement comprehensive geriatric interventions that can benefit Peruvian Navy Veteran's older adults at risk of becoming frail. PMID:23978328

Runzer-Colmenares, Fernando M; Samper-Ternent, Rafael; Al Snih, Soham; Ottenbacher, Kenneth J; Parodi, José F; Wong, Rebeca



System identification of smart structures using a wavelet neuro-fuzzy model  

NASA Astrophysics Data System (ADS)

This paper proposes a complex model of smart structures equipped with magnetorheological (MR) dampers. Nonlinear behavior of the structure-MR damper systems is represented by the use of a wavelet-based adaptive neuro-fuzzy inference system (WANFIS). The WANFIS is developed through the integration of wavelet transforms, artificial neural networks, and fuzzy logic theory. To evaluate the effectiveness of the WANFIS model, a three-story building employing an MR damper under a variety of natural hazards is investigated. An artificial earthquake is used for training the input-output mapping of the WANFIS model. The artificial earthquake is generated such that the characteristics of a variety of real recorded earthquakes are included. It is demonstrated that this new WANFIS approach is effective in modeling nonlinear behavior of the structure-MR damper system subjected to a variety of disturbances while resulting in shorter training times in comparison with an adaptive neuro-fuzzy inference system (ANFIS) model. Comparison with high fidelity data proves the viability of the proposed approach in a structural health monitoring setting, and it is validated using known earthquake signals such as El-Centro, Kobe, Northridge, and Hachinohe.

Mitchell, Ryan; Kim, Yeesock; El-Korchi, Tahar



Mexican-US cooperation on renewable energy programs  

NASA Astrophysics Data System (ADS)

I traveled to Mexico on April 1 with Pete Smith and Chris Rovero of Oak Ridge Associated Universities on a mission sponsored by the Agency for International Development (AID) to initiate a technical support project with Mexican government and private institutions. We met with officials of AID; the Programa Nacional de Solidaridad; the Laboratorio de Energia Solar; Instituto Investigaciones de Electricidad; Comision Federal de Electricidad; Compania de Luz y Fuerza del Centro; and several private firms to discuss the terms of support. An AIDE Memoire was drafted outlining the scope of future assistance. I traveled to San Jose, Cost Rica on April 7, 1991. There I met with Carlos Rodriguez, manager of Cooperativa Electrica de San Carlos, and Federico Baltodano, the director of BEL Ingenieria to discuss the San Lorenzo hydroelectric project. Details of an engineering and financial analysis outlining the costs and benefits of adding daily pondage to the project were discussed, as was the project development schedule and other issues. I returned to Oak Ridge on April 9, 1991.

Waddle, D. B.



A quoi servent les reunions d'enseignants?  

NASA Astrophysics Data System (ADS)

The Centro Psico-Pedagógico para la Educación del Deficiente Sensorial (C.P.E.D.S.) in Barcelona was established for the purpose of integrating children with sensory handicaps into so-called `normal' schools. On the basis of a longitudinal study carried out in 12 schools between 1978 and 1986, the authors have analysed the data collected on teachers' meetings. Using an ethnographically based approach, they have identified three types of meeting: evaluatory meetings for all classes in one year-group in which teachers, specialist staff and the director participate; scheduled meetings between one teacher and the C.P.E.D.S. specialist; and informal, so-called `corridor' meetings between the latter. At the first level the actions of participants have been analysed, in order to try and bring into the open the latter's roles, rituals, defence strategies and methods of evasion. By way of synthesis, the analysis is finally placed once more into its institutional and historical context, the aim being to indicate the disparity between the explicit objectives of the teachers' meetings and the manner in which these function.

Martinez, Isabel; Vasquez, Ana



Nucleic-acid characterization of the identity and activity of subsurface microorganisms  

NASA Astrophysics Data System (ADS)

Nucleic-acid approaches to characterizing naturally occurring microorganisms in their habitats have risen to prominence during the last decade. Extraction of deoxyribonucleic-acid (DNA) and ribonucleic-acid (RNA) biomarkers directly from environmental samples provides a new means of gathering information in microbial ecology. This review article defines: (1) the subsurface habitat; (2) what nucleic-acid procedures are; and (3) the types of information nucleic-acid procedures can and cannot reveal. Recent literature examining microbial nucleic acids in the terrestrial subsurface is tabulated and reviewed. The majority of effort to date has focused upon insights into the identity and phylogeny of subsurface microorganisms afforded by analysis of their 16S rRNA genes. Given the power of nucleic-acid-based procedures and their limited application to subsurface habitats to date, many future opportunities await exploration. Au cours des derniers dix ans, les approches basées sur les acides nucléiques sont apparues et devenues essentielles pour caractériser dans leurs habitats les microorganismes existant à l'état naturel. L'extraction directe de l'ADN et de l'ARN, qui sont des biomarqueurs, d'échantillons environnementaux a fourni un nouveau moyen d'obtenir des informations sur l'écologie microbienne. Cet article synthétique définit 1) l'habitat souterrain, 2) ce que sont les procédures basées sur les acides nucléiques, 3) quel type d'informations ces procéedures peuvent et ne peuvent pas révéler. Les travaux récemment publiés concernatn les acides nucléiques microbiens dans le milieu souterrain terrestre sont catalogués et passés en revue. La majorité des efforts pour obtenir es données s'est concentrée sur l'identité et la phylogénie des microorganismes souterrains fournies par l'analyse de leurs gènes 16S rRNA. Étant donné la puissance des procédures basées sur les acides nucléiques et leur application limitée aux habitats souterrains pour obtenir des données, de nombreuses futures occasions sont dans l'attente d'explorations. Los métodos basados en ácidos nucleicos para la caracterización de microorganismos en sus propios hábitats han experimentado un gran auge en la última década. La extracción directa en muestras de los biomarcadores ácido desoxirribonucleico (ADN) y ribonucleico (ARN) supone un nuevo método para obtener información sobre ecología microbiana. En este articulo se definen: (1) el nuevo métidi para obtener información sobre ecología microbiana. En este artículo se definen: (1) el hábitat subsuperficial; (2) qué son los métodos basados en ácidos nucleicos; y (3) la información que estos métodos pueden proporcionar. Se revisa y tabula la bibliografía reciente sobre ácidos nucleicos microbianos en la subsuperficie. Hasta ahora la mayoría de estos estudios se han centrado en la identificación y filogenia de los microorganismos, mediante el análisis de sus genes 16S rRNA. Dado el potencial de las técnicas basadas en ácidos nucleicos y el hecho de que hasta ahora su aplicación a los hábitats subsuperficiales haya sido limitada, se presentan muchas opotunidades de futuro.

Madsen, E. L.


Relation of streams, lakes, and wetlands to groundwater flow systems  

NASA Astrophysics Data System (ADS)

Surface-water bodies are integral parts of groundwater flow systems. Groundwater interacts with surface water in nearly all landscapes, ranging from small streams, lakes, and wetlands in headwater areas to major river valleys and seacoasts. Although it generally is assumed that topographically high areas are groundwater recharge areas and topographically low areas are groundwater discharge areas, this is true primarily for regional flow systems. The superposition of local flow systems associated with surface-water bodies on this regional framework results in complex interactions between groundwater and surface water in all landscapes, regardless of regional topographic position. Hydrologic processes associated with the surface-water bodies themselves, such as seasonally high surface-water levels and evaporation and transpiration of groundwater from around the perimeter of surface-water bodies, are a major cause of the complex and seasonally dynamic groundwater flow fields associated with surface water. These processes have been documented at research sites in glacial, dune, coastal, mantled karst, and riverine terrains. Résumé Les eaux de surface sont parties intégrantes des systèmes aquifères. Les eaux souterraines interagissent avec les eaux de surface dans presque tous les types d'environnements, depuis les petits ruisseaux, les lacs et les zones humides jusqu'aux bassins versants des vallées des grands fleuves et aux lignes de côte. Il est en général admis que les zones topographiquement hautes sont des lieux de recharge des aquifères et les zones basses des lieux de décharge, ce qui est le cas des grands systèmes aquifères régionaux. La superposition de systèmes locaux, associés à des eaux de surface, à l'organisation régionale d'écoulements souterrains résulte d'interactions complexes entre les eaux souterraines et les eaux de surface dans tous les environnements, quelle que soit la situation topographique régionale. Les processus hydrologiques associés aux eaux de surface elles-mêmes, tels que des niveaux d'eau de surface saisonnièrement hauts et l'évaporation et la transpiration de l'eau souterraine à la périphérie des eaux de surface, sont les causes essentielles de la dynamique complexe et saisonnière des nappes associées aux eaux de surface. Ces processus ont été mis en évidence sur des sites de recherche dans des formations glaciaires, dunaires, littorales, fluviales et de karst couvert. Resumen Los cuerpos de aguas superficiales son partes integrales de los sistemas de flujo subterráneo. El agua subterránea interactúa con la superficial en prácticamente todo tipo de paisajes, desde pequeños torrentes, lagos y humedales, hasta grandes valles fluviales y costas. Aunque se suele asumir que las áreas topográficamente elevadas son zonas de recarga de aguas subterráneas, mientras las áreas topográficamente más bajas lo son de descarga, esto es cierto básicamente para los sistemas de flujo regional. Al superponer los sistemas de flujo local, asociados a los cuerpos de agua superficial, a las condiciones regionales, resultan interacciones complejas, y esto ocurre independientemente de su posición topográfica. Los procesos hidrológicos asociados con los propios cuerpos de agua superficial, como los niveles superficiales máximos estacionales y la evapotranspiración de agua subterránea en los perímetros de cuerpos superficiales, son una de las principales causas de la complejidad y de las variaciones dinámicas de las interacciones entre aguas subterráneas y superficiales. Estos procesos se han documentado en distintas zonas investigadas, incluyendo depósitos glaciares, dunas, áreas costeras, karsts y terrazas fluviales.

Winter, Thomas C.


Geomorphic aspects of groundwater flow  

NASA Astrophysics Data System (ADS)

The many roles that groundwater plays in landscape evolution are becoming more widely appreciated. In this overview, three major categories of groundwater processes and resulting landforms are considered: (1) Dissolution creates various karst geometries, mainly in carbonate rocks, in response to conditions of recharge, geologic setting, lithology, and groundwater circulation. Denudation and cave formation rates can be estimated from kinetic and hydraulic parameters. (2) Groundwater weathering generates regoliths of residual alteration products at weathering fronts, and subsequent exhumation exposes corestones, flared slopes, balanced rocks, domed inselbergs, and etchplains of regional importance. Groundwater relocation of dissolved salts creates duricrusts of various compositions, which become landforms. (3) Soil and rock erosion by groundwater processes include piping, seepage erosion, and sapping, important agents in slope retreat and headward gully migration. Thresholds and limits are important in many chemical and mechanical groundwater actions. A quantitative, morphometric approach to groundwater landforms and processes is exemplified by selected studies in carbonate and clastic terrains of ancient and recent origins. Résumé Les rôles variés joués par les eaux souterraines dans l'évolution des paysages deviennent nettement mieux connus. La revue faite ici prend en considération trois grandes catégories de processus liés aux eaux souterraines et les formes associées: (1) La dissolution crée des formes karstiques variées, surtout dans les roches carbonatées, en fonction des conditions d'alimentation, du cadre géologique, de la lithologie et de la circulation des eaux souterraines. Les taux d'érosion et de formation des grottes peuvent être estimés à partir de paramètres cinétiques et hydrauliques. (2) L'érosion par les eaux souterraines donne naissance à des régolites, résidus d'altération sur des fronts d'altération, et l'exhumation résultante fait apparaître des rognons, des pentes qui s'évasent, des roches en équilibre, des inselbergs et des plaines de corrosion d'extension régionale. La migration des sels dissous des eaux souterraines crée des croûtes de compositions variées, qui constituent des paysages particuliers. (3) Les processus d'érosion des sols et des roches par les eaux souterraines comprennent les phénomènes suivants: la chenalisation, l'érosion par suintement, le sapement, qui tous sont des agents notables du recul des versants et d'érosion régressive vers l'amont. Les seuils et les limites sont importants dans de nombreuses actions chimiques et mécaniques des eaux souterraines. Une approche morphométrique quantitative des formes et des processus liés aux eaux souterraines est donnée en exemple à partir d'études choisies dans les terrains carbonatés et détritiques d'origine aussi bien ancienne que récente. Resumen Las aguas subterráneas tienen una importancia fundamental en la evolución de los paisajes geomorfológicos. En este artículo se consideran tres grandes categorías de procesos ligados al agua subterránea y sus correspondientes paisajes resultantes: (1) La disolución crea distintas geometrías kársticas, fundamentalmente en rocas carbonatadas, como respuesta a las condiciones de recarga, condicionantes geológicos, litologías y al propio flujo de agua subterránea. La velocidad de denudación y formación de cavernas se puede estimar a partir de los parámetros cinéticos e hidráulicos. (2) La erosión producida por las aguas subterráneas genera regolitas de alteración residual en los frentes de erosión, con los subsiguientes afloramientos de rocas inalteradas, inselbergs, rocas oscilantes o llanuras de corrosión de carácter regional. La recolocación de las sales disueltas crea costras superficiales de diferente composición. (3) La erosión de rocas y suelos por procesos ligados al agua subterránea, como filtración y arrastre de finos da lugar a un movimiento de retroceso de taludes y barrancos. La existencia de umbrales y lím

LaFleur, Robert G.


Current knowledge on groundwater microbial pathogens and their control  

NASA Astrophysics Data System (ADS)

Those who drink groundwater that has not been disinfected are at increased risk of infection and disease from pathogenic microorganisms. Recent studies have shown that up to half of all US drinking-water wells tested had evidence of fecal contamination. A significant fraction of all waterborne disease outbreaks is associated with groundwater. An estimated 750,000 to 5.9million illnesses per year result from contaminated groundwaters in the US. Mortality from these illnesses may be 1400-9400 deaths per year. Control of these pathogens starts with source-water protection activities to prevent fecal contamination of aquifers and wells. These include assessment of wellhead vulnerability to fecal contamination and correction of identified deficiencies. Correction may include control of sources or rehabilitation of the well itself. Disinfection can serve as a useful barrier and is recommended as a prudent public-health policy for all groundwater systems. Ceux qui boivent une eau souterraine non désinfectée présentent un risque accru d'infection et de maladie par des germes pathogènes. De récentes études ont montré que près de la moitié de tous les puits américains testés, captés pour l'eau potable, sont soumis à une contamination fécale. Une fraction significative de l'ensemble des premières manifestations de maladies liées à l'eau est associée aux eaux souterraines. On estime qu'entre 750 000 et 5,9millions de personnes sont malades chaque année aux États-Unis à cause d'eaux souterraines polluées. La mortalité parmi ces malades doit ètre de l'ordre de 1400 à 9400 décès par an. La protection contre ces germes pathogènes commence avec des mesures prises au niveau du captage pour empècher la pollution des aquifères et des puits. Celles-ci comprennent une évaluation de la vulnérabilité des tètes de puits à la pollution fécale et une correction des insuffisances mises en évidence. Cette correction peut comprendre une maîtrise des sources de pollution ou la réhabilitation du puits lui-mème. La désinfection peut ètre une précaution utile et est recommandée comme une mesure prudente de santé publique pour toutes les nappes aquifères. Beber agua subterránea no desinfectada supone un riesgo de infección por microorganismos patógenos. Estudios recientes muestran que la mitad de los pozos de abastecimiento analizados en los EEUU presentan evidencia de contaminación fecal. Un porcentaje significativo de la aparición de enfermedades transmitidas por el agua puede asociarse a las aguas subterráneas, estimándose que por contaminación de las mismas se registran, sólo en ese país, entre 750.000 y 5.9millones de personas enfermas y entre 1400-9400 muertos por año. El control de estos patógenos empieza con la protección de la fuente para prevenir la contaminación fecal de pozos y acuíferos. Esto supone evaluar la vulnerabilidad y corregir las posibles deficiencias detectadas, lo que incluye controlar los trabajos de rehabilitación del propio pozo. La desinfección puede servir como una barrera a los microorganismos patógenos, por lo que se recomienda como una política prudente de salud pública en zonas abastecidas con aguas subterráneas.

Macler, Bruce A.; Merkle, Jon C.


Analytical results and sample locality map for rock, stream-sediment, and soil samples, Northern and Eastern Coloado Desert BLM Resource Area, Imperial, Riverside, and San Bernardino Counties, California  

USGS Publications Warehouse

INTRODUCTION In 1996-1998 the U.S. Geological Survey (USGS) conducted a geochemical study of the Bureau of Land Management's (BLM) 5.5 million-acre Northern and Eastern Colorado Desert Resource Area (usually referred to as the NECD in this report), Imperial, Riverside, and San Bernardino Counties, southeastern California (figure 1). This study was done in support of the BLM's Coordinated Management Plan for the area. This report presents analytical data from this study. To provide comprehensive coverage of the NECD, we compiled and examined all available geochemical data, in digital form, from previous studies in the area, and made sample-site plots to aid in determining where sample-site coverage and analyses were sufficient, which samples should be re-analyzed, and where additional sampling was needed. Previous investigations conducted in parts of the current study area included the National Uranium Resource Evaluation (NURE) program studies of the Needles and Salton Sea 1? x 2? quadrangles; USGS studies of 12 BLM Wilderness Study Areas (WSAs) (Big Maria Mountains, Chemehuevi Mountains, Chuckwalla Mountains, Coxcomb Mountains, Mecca Hills, Orocopia Mountains, Palen-McCoy, Picacho Peak, Riverside Mountains, Sheephole Valley (also known as Sheep Hole/Cadiz), Turtle Mountains, and Whipple Mountains); and USGS studies in the Needles and El Centro 1? x 2? quadrangles done during the early 1990s as part of a project to identify the regional geochemistry of southern California. Areas where we did new sampling of rocks and stream sediments are mainly in the Chocolate Mountain Aerial Gunnery Range and in Joshua Tree National Park, which extends into the west-central part of the NECD, as shown in figure 1 and figure 2. This report contains analytical data for 132 rock samples and 1,245 stream-sediment samples collected by the USGS, and 362 stream-sediment samples and 189 soil samples collected during the NURE program. All samples are from the Northern and Eastern Colorado Desert BLM Resource Area and vicinity. Included in the 1,245 stream-sediment samples collected by the USGS are 284 samples collected as part of the current study, 817 samples collected as part of investigations of the12 BLM WSAs and re-analyzed for the present study, 45 samples from the Needles 1? X 2? quadrangle, and 99 samples from the El Centro 1? X 2? quadrangle. The NURE stream-sediment and soil samples were re-analyzed as part of the USGS study in the Needles quadrangle. Analytical data for samples from the Chocolate Mountain Aerial Gunnery Range, which is located within the area of the NECD, were previously reported (King and Chaffee, 1999a). For completeness, these results are also included in this report. Analytical data for samples from the area of Joshua Tree National Park that is within the NECD have also been reported (King and Chaffee, 1999b). These results are not included in this report. The analytical data presented here can be used for baseline geochemical, mineral resource, and environmental geochemical studies.

King, Harley D.; Chaffee, Maurice A.




SciTech Connect

After recent sensitivity upgrades at the Keck Interferometer (KI), systematic interferometric 2 {mu}m studies of the innermost dust in nearby Seyfert nuclei are within observational reach. Here, we present the analysis of new interferometric data of NGC 4151, discussed in context of the results from recent dust reverberation, spectro-photometric, and interferometric campaigns. The complete data set gives a complex picture, in particular the measured visibilities from now three different nights appear to be rather insensitive to the variation of the nuclear luminosity. KI data alone indicate two scenarios: the K-band emission is either dominated to {approx}90% by size scales smaller than 30 mpc, which falls short of any dust reverberation measurement in NGC 4151 and of theoretical models of circum-nuclear dust distributions. Or contrary, and more likely, the K-band continuum emission is dominated by hot dust ({approx}>1300 K) at linear scales of about 50 mpc. The linear size estimate varies by a few tens of percent depending on the exact morphology observed. Our interferometric, deprojected centro-nuclear dust radius estimate of 55 {+-} 5 mpc is roughly consistent with the earlier published expectations from circum-nuclear, dusty radiative transfer models, and spectro-photometric modeling. However, our data do not support the notion that the dust emission size scale follows the nuclear variability of NGC 4151 as an R {sub dust} {proportional_to} L {sup 0.5} {sub nuc} scaling relation. Instead variable nuclear activity, lagging, and variable dust response to illumination changes need to be combined to explain the observations.

Pott, Jorg-Uwe; Herbst, Tom M. [Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Malkan, Matt A.; Ghez, Andrea M. [Division of Astronomy and Astrophysics, University of California, Los Angeles, CA 90095-1547 (United States); Elitzur, Moshe [Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055 (United States); Schoedel, Rainer [Instituto de Astrofisica de Andalucia-CSIC, Camino Bajo de Huetor 50, 18008 Granada (Spain); Woillez, Julien, E-mail: jpott@mpia.d, E-mail: herbst@mpia.d, E-mail: malkan@astro.ucla.ed, E-mail: ghez@astro.ucla.ed, E-mail: jwoillez@keck.hawaii.ed, E-mail: moshe@pa.uky.ed, E-mail: rainer@iaa.e [W. M. Keck Observatory, California Association for Research in Astronomy, Kamuela, HI 96743 (United States)



Liver precursor cells increase hepatic fibrosis induced by chronic carbon tetrachloride intoxication in rats  

PubMed Central

Hepatic fibrosis, the major complication of virtually all types of chronic liver damage, usually begins in portal areas, and its severity has been correlated to liver progenitor cells (LPC) expansion from periportal areas, even if the primary targets of injury are intralobular hepatocytes. The aim of this study was to determine the potential fibrogenic role of LPC, using a new experimental model in which rat liver fibrosis was induced by chronic carbon tetrachloride (CCl4) administration for 6 weeks, in combination with chronic acetylaminofluorene treatment (AAF), which promotes activation of LPC compartment. Treatment with CCl4 alone caused a significant increase in serum transaminase activity as well as liver fibrosis initiating around central veins and leading to formation of incomplete centro-central septa with sparse fibrogenic cells expressing ?-smooth muscle actin (?SMA). In AAF/CCl4-treated animals, the fibrogenic response was profoundly worsened, with formation of multiple porto-central bridging septa leading to cirrhosis, whereas hepatocellular necrosis and inflammation were similar to those observed in CCl4-treated animals. Enhanced fibrosis in AAF/CCl4 group was accompanied by ductule forming LPC expanding from portal areas, ?SMA-positive cells accumulation in the fibrotic areas and increased expression of hepatic collagen type 1, 3 and 4 mRNA. Moreover, CK19-positive LPC expressed the most potent fibrogenic cytokine transforming growth factor-? (TGF?) without any expression of ?SMA, desmin or fibroblast-specific protein-1, demonstrating that LPC did not undergo an epithelial-mesenchymal transition. In this new experimental model, LPC, by expressing TGF? contributed to the accumulation of ?SMA-positive myofibroblasts in the ductular reaction leading to enhanced fibrosis but also to disease progression and to a fibrotic pattern similar to that observed in human.

Chobert, Marie-Noele; Couchie, Dominique; Fourcot, Agnes; Zafrani, Elie-Serge; Laperche, Yannick; Mavier, Philippe; Brouillet, Arthur



Quantum interference control of free carrier photo- injection in bulk gallium arsenide  

NASA Astrophysics Data System (ADS)

The total absorption rate of optical beams with commensurate frequencies in a semi-conductor is dynamically controlled by the phase of the incident light fields. Phase control of free carrier injection arises from quantum interference between the linear and nonlinear absorption pathways that access the same initial and final states in the continuum bands, as detailed by a Fermi Golden Rule analysis. Carrier density and optical transmission control was demonstrated in bulk GaAs for two different interference schemes: one- vs. two-photon absorption (with beams of wavelengths 0.775 and 1.55 ?m) and one- vs. three-photon absorption (with beams of wavelengths 0.675 and 2.03 ?m). All experiments were done at room temperature using subpicosecond optical pulses. The schemes are representative of two classes of interference control categorized according to their material symmetry dependence. Interference between A- and B-photon absorption, where A+B is an odd number, can be observed only in a crystal without a centre of inversion. If A+B is even, interference can be observed in both centro- and noncentrosymmetric materials. The establishment of the quantum interference process within the nonlinear susceptibility formalism provides a new interpretation of the origins of certain tensor contributions to the optical response. The phase-dependent contribution to carrier injection arising from interference in the A+B scheme is related to the imaginary part of the nonlinear electric susceptibility, ?A+B -1. For the first time, ?2 and other odd-rank tensors are linked to energy absorption. Experimental results in conjunction with numerical modeling of the nonlinear mixing process provide a novel method of extracting the magnitude of the imaginary relative to real components of ? 2 and ?3 for GaAs at 1.55 ?m and 2.03 ?m respectively.

Fraser, James Mckinnon


Mortality by neoplasia and cellular telephone base stations in the Belo Horizonte municipality, Minas Gerais state, Brazil.  


Pollution caused by the electromagnetic fields (EMFs) of radio frequencies (RF) generated by the telecommunication system is one of the greatest environmental problems of the twentieth century. The purpose of this research was to verify the existence of a spatial correlation between base station (BS) clusters and cases of deaths by neoplasia in the Belo Horizonte municipality, Minas Gerais state, Brazil, from 1996 to 2006 and to measure the human exposure levels to EMF where there is a major concentration of cellular telephone transmitter antennas. A descriptive spatial analysis of the BSs and the cases of death by neoplasia identified in the municipality was performed through an ecological-epidemiological approach, using georeferencing. The database employed in the survey was composed of three data banks: 1. death by neoplasia documented by the Health Municipal Department; 2. BSs documented in ANATEL ("Agência Nacional de Telecomunicações": 'Telecommunications National Agency'); and 3. census and demographic city population data obtained from official archives provided by IBGE ("Instituto Brasileiro de Geografia e Estatística": 'Brazilian Institute of Geography and Statistics'). The results show that approximately 856 BSs were installed through December 2006. Most (39.60%) of the BSs were located in the "Centro-Sul" ('Central-Southern') region of the municipality. Between 1996 and 2006, 7191 deaths by neoplasia occurred and within an area of 500 m from the BS, the mortality rate was 34.76 per 10,000 inhabitants. Outside of this area, a decrease in the number of deaths by neoplasia occurred. The greatest accumulated incidence was 5.83 per 1000 in the Central-Southern region and the lowest incidence was 2.05 per 1000 in the Barreiro region. During the environmental monitoring, the largest accumulated electric field measured was 12.4 V/m and the smallest was 0.4 V/m. The largest density power was 40.78 ?W/cm(2), and the smallest was 0.04 ?W/cm(2). PMID:21741680

Dode, Adilza C; Leão, Mônica M D; Tejo, Francisco de A F; Gomes, Antônio C R; Dode, Daiana C; Dode, Michael C; Moreira, Cristina W; Condessa, Vânia A; Albinatti, Cláudia; Caiaffa, Waleska T



Chronic contamination assessment integrating biomarkers' responses in transplanted mussels--a seasonal monitoring.  


This study aimed to provide the first biomonitoring integrating biomarkers and bioaccumulation data in São Paulo coast, Brazil and, for this purpose, a battery of biomarkers of defense mechanisms was analyzed and linked to contaminants' body burden in a weigh-of-evidence approach. The brown mussel Perna perna was selected to be transplanted from a farming area (Caraguatatuba) to four possibly polluted sites: Engenho D'Água, DTCS (Dutos e Terminais do Centro-Oeste de São Paulo) oil terminal (Sao Sebastiao zone), Palmas Island, and Itaipu (It; Santos Bay zone). After 3 months of exposure in each season, mussels were recollected and the cytochrome P4501A (CYP1A)- and CYP3A-like activities, glutathione-S-transferase and antioxidants enzymes (catalase, glutathione peroxidase, and glutathione reductase) were analyzed in gills. The concentrations of polycyclic aromatic hydrocarbons, linear alkylbenzenes, and nonessential metals (Cr, Cd, Pb, and Hg) in whole tissue were also analyzed and data were linked to biomarkers' responses by multivariate analysis (principal component analysis-factor analysis). A representation of estimated factor scores was performed to confirm the factor descriptions and to characterize the studied stations. Biomarkers exhibited most significant alterations all year long in mussels transplanted to It, located at Santos Bay zone, where bioaccumulation of organic and inorganic compounds was detected. This integrated approach using transplanted mussels showed satisfactory results, pointing out differences between sites, seasons, and critical areas, which could be related to land-based contaminants' sources. The influence of natural factors and other contaminants (e.g., pharmaceuticals) on biomarkers' responses are also discussed. PMID:20725937

Pereira, C D S; Martín-Díaz, M L; Catharino, M G M; Cesar, A; Choueri, R B; Taniguchi, S; Abessa, D M S; Bícego, M C; Vasconcellos, M B A; Bainy, A C D; Sousa, E C P M; Delvalls, T A



Understanding and Imitating Unfamiliar Actions: Distinct Underlying Mechanisms  

PubMed Central

The human “mirror neuron system” has been proposed to be the neural substrate that underlies understanding and, possibly, imitating actions. However, since the brain activity with mirror properties seems insufficient to provide a good description for imitation of actions outside one’s own repertoire, the existence of supplementary processes has been proposed. Moreover, it is unclear whether action observation requires the same neural mechanisms as the explicit access to their meaning. The aim of this study was two-fold as we investigated whether action observation requires different processes depending on 1) whether the ultimate goal is to imitate or understand the presented actions and 2) whether the to-be-imitated actions are familiar or unfamiliar to the subject. Participants were presented with both meaningful familiar actions and meaningless unfamiliar actions that they had to either imitate or discriminate later. Event-related Potentials were used as differences in brain activity could have been masked by the use of other techniques with lower temporal resolution. In the imitation task, a sustained left frontal negativity was more pronounced for meaningless actions than for meaningful ones, starting from an early time-window. Conversely, observing unfamiliar versus familiar actions with the intention of discriminating them led to marked differences over right centro-posterior scalp regions, in both middle and latest time-windows. These findings suggest that action imitation and action understanding may be sustained by dissociable mechanisms: while imitation of unfamiliar actions activates left frontal processes, that are likely to be related to learning mechanisms, action understanding involves dedicated operations which probably require right posterior regions, consistent with their involvement in social interactions.

Carmo, Joana C.; Rumiati, Raffaella I.; Vallesi, Antonino